apparent (adj.)
late 14c., "indisputable, clearly understood;" c. 1400, "easily seen or perceived," from Old French aparant "evident, obvious, visible," from Latin apparentem (nominative apparens) "visible, manifest," present participle of apparere "appear, come in sight" (see appear).

First attested in phrases such as heir apparent (see heir). Meaning "superficial, spurious" is from c. 1400; that of "appearing to the senses or mind but not necessarily real" is from 1640s. Apparent magnitude in astronomy (how bright a heavenly body looks from earth, as opposed to absolute magnitude, which is how bright it really is) is attested from 1875. Middle English had noun forms apparence, apparency, but both are obsolete from 17c.
apparently (adv.)
late 14c., "visibly, openly," from apparent + -ly (2). Meaning "evidently" is from 1550s; that of "to all appearances" (but not necessarily "really") is from 1560s; meaning "so far as can be judged" is from 1846.
apparition (n.)
early 15c., "supernatural appearance or manifestation," from Anglo-French aparicion, Old French aparicion, aparoison (15c.), used in reference to the Epiphany (the revealing of the Christ child to the Wise Men), from Late Latin apparitionem (nominative apparitio) "an appearance," also "attendants," in classical Latin "service; servants," noun of action from past participle stem of apparere "appear" (see appear). Meaning "ghost" first recorded c. 1600; the sense differentiation between appearance and apparition is that the latter tends to be unexpected or startling. Related: Apparitional.
appeach (v.)
obsolete variant form of impeach. Related: Appeached; appeaching.
appeal (n.)
c. 1300, "proceeding taken to reverse a decision by submitting it to the review of a higher authority," from Old French apel "call, appeal in court" (Modern French appel), back-formation from apeler "call upon" (see appeal (v.)). Meaning "call to an authority" is from 1620s; that of "attractive power" attested by 1904.
appeal (v.)
early 14c., originally in legal sense of "to call" to a higher judge or court, from Anglo-French apeler "to call upon, accuse," Old French apeler "make an appeal" (11c., Modern French appeler), from Latin appellare "to accost, address, appeal to, summon, name," iterative of appellere "to prepare," from ad "to" (see ad-) + pellere "to beat, push, drive" (from PIE root *pel- (5) "to thrust, strike, drive").

Probably a Roman metaphoric extension of a nautical term for "driving a ship toward a particular landing." Popular modern meaning "be attractive or pleasing" is attested from 1907 (appealing in this sense is from 1891), extended from "address oneself in expectation of a sympathetic response" (1794). Related: Appealed.
appealing (adj.)
1590s, "suppliant, applying to a higher authority," present-participle adjective from appeal (v.). Sense of "attractive" attested by 1892. Related: Appealingly.
appear (v.)
late 13c., "come into view," from stem of Old French aparoir, aperer "appear, come to light, come forth" (12c., Modern French apparoir), from Latin apparere "to appear, come in sight, make an appearance," from ad "to" (see ad-) + parere "to come forth, be visible," which is of uncertain origin. Of persons, "present oneself," late 14c. Meaning "seem, have a certain appearance" is late 14c. Related: Appeared; appearing.
appearance (n.)
late 14c., "visible state or form, figure; mere show," from Anglo-French apparaunce, Old French aparance "appearance, display, pomp" (13c.), from Latin apparentia, abstract noun from aparentem, past participle of apparere "come in sight, make an appearance," especially "be evident, be seen in public, show oneself" (see appear).

Meaning "semblance" is recorded from early 15c.; that of "action of coming into view" is mid-15c.; that of "a coming before the public or an audience" is from 1670s. Phrase keeping up appearances attested from 1751 (save appearances in same sense is 1711).
appeasable (adj.)
"capable of being calmed or pacified," 1540s; see appease + -able. Related: Appeasably.
appease (v.)
c. 1300 "to reconcile," from Anglo-French apeser, Old French apaisier "to pacify, make peace, appease, be reconciled, placate" (12c.), from the phrase a paisier "bring to peace," from a "to" (see ad-) + pais, from Latin pacem (nominative pax) "peace" (see peace). Meaning "pacify (one who is angry)" is from late 14c.; for political sense, see appeasement. Related: Appeased; appeasing.
appeasement (n.)
mid-15c., "pacification," from Middle French apeisement, Old French apaisement "appeasement, calming," noun of action from apaisier "pacify, make peace, placate" (see appease). First recorded 1919 in international political sense; not pejorative until the failure of British Prime Minister Neville Chamberlain's policy toward Germany in 1939 (methods of appeasement was Chamberlain's description of his policy).
appeaser (n.)
mid-15c., agent noun from appease (v.). Political sense attested from 1940.
appellant (n.)
"one who appeals from a lower to a higher court," 1610s, from Anglo-French, French appellant, noun use of present participle of French appeller "make an appeal" (Old French apeler), from Latin appellare "appeal to" (see appeal (v.)).
appellate (adj.)
"pertaining to appeals," 1726, from Latin appellatus, past participle of appellare "appeal to" (see appeal (v.)).
appellation (n.)
"designation, name given to a person, thing, or class," mid-15c., from Old French apelacion "name, denomination" (12c.), from Latin appellationem (nominative appellatio) "an addressing, accosting; an appeal; a name, title," noun of action from past participle stem of appellare "address, appeal to, name" (see appeal (v.)).
appellative (adj.)
early 15c., of a noun, "serving to name or mark out, common (as opposed to proper)," from Latin appellativus, from appellat-, past participle stem of appellare "address, name, appeal to" (see appeal (v.)). As a noun, attested from 1590s, "common name;" 1630s as "title, descriptive name."
appellee (n.)
"person against whom an appeal is brought," 1530s, from Anglo-French (late 14c.), from Old French apelé (Modern French appelé) "accused, defendant," noun use of past participle of appeler "speak to, call upon, appeal to, address, call by name;" see appeal (v.) + -ee.
append (v.)
late 14c., "to belong to as a possession or right," from Old French apendre (13c.) "belong, be dependent (on); attach (oneself) to; hang, hang up," and directly from Latin appendere "cause to hang (from something); weigh out," from ad "to" (see ad-) + pendere "to hang, cause to hang; weight; pay" (from PIE root *(s)pen- "to draw, stretch, spin").

Meaning "to hang on, attach as a pendant" is 1640s; that of "attach as an appendix" is recorded by 1843. OED says the original word was obsolete by c. 1500, and these later transitive senses thus represent a reborrowing from Latin or French. Related: Appended; appending.
appendage (n.)
"that which is appended to something as a proper part," 1640s, from append + -age.
appendectomy (n.)
1891, a hybrid from appendix in the anatomical sense + -ectomy.
appendices (n.)
proper Latin plural of appendix.
appendicitis (n.)
"inflammation of the vermiform appendix," 1886, from Latin stem of appendix, in the medical sense, + -itis "inflammation."
appendicular (adj.)
1650s, from Latin appendicula "a little addition, small appendage," diminutive of appendix (see appendix) + -ar. In anatomy, opposed to axial.
appendix (n.)
1540s, "subjoined addition to a document or book," from Latin appendix "an addition, continuation, something attached," from appendere "cause to hang (from something)," from ad "to" (see ad-) + pendere "to hang" (from PIE root *(s)pen- "to draw, stretch, spin"). Used for "small outgrowth of an internal organ" from 1610s, especially in reference to the vermiform appendix. This sense in English is perhaps from or influenced by French appendix, where the term was in use in anatomy from 1540s.
apperceive (v.)
c. 1300, "to perceive, notice," especially of internal observation (a sense now obsolete), from Old French apercevoir "perceive, notice, become aware of" (11c.), from Latin ad "to" (see ad-) + percipere "gather, seize entirely," also, figuratively, "to grasp with the mind, learn, comprehend" (see perceive. In modern psychological use (1876), a back-formation from apperception (q.v.). Related: Apperceived; apperceiving; apperceptive.
apperception (n.)
1753, "self-consciousness," from French aperception (17c.), from Latin apperceptionem, from ad "to" (see ad-) + percipere; see perceive). The meaning "act of the mind by which it becomes conscious of its ideas as its own (1876) is from German Apperzeption, coined by German mathematician and philosopher Gottfried Wilhelm Leibniz (1646-1716) as noun corresponding to French apercevoir "perceive, notice, become aware of" on analogy of Perzeption/percevoir.
appertain (v.)
late 14c., "to belong as parts to the whole, or as members to a family or class, belong by association or attribution," from Anglo-French apartenir, Old French apartenir "be related to; be incumbent upon" (12c.), from Late Latin appertinere "to pertain to," from ad "to; completely" (see ad-) + pertinere "to belong to" (see pertain). Related: Appertained; appertaining.
appetence (n.)
"strong desire, act of seeking or craving that which satisfies the senses," c. 1600, from French appétence "desire," from Latin appetentia "longing after something," abstract noun from appetentem (nominative appetens), present participle of appetere, from ad "to" (see ad-) + petere "to seek, request" (see petition (n.)). Related: Appetency.
appetite (n.)
c. 1300, "craving for food," from Anglo-French appetit, Old French apetit "appetite, desire, eagerness" (13c., Modern French appétit), from Latin appetitus "appetite, longing," literally "desire toward," from appetitus, past participle of appetere "to long for, desire; strive for, grasp at," from ad "to" (see ad-) + petere "go to, seek out," from PIE root ^pet- "to rush, fly" (see petition (n.)).

Formerly with of or to, now with for. Of other desires or cravings, from late 14c. As an adjective, "characterized by appetite," OED and Century Dictionary list appetitious (1650s) and appetitual (1610s) as obsolete, but appetitive (1570s) continues.
appetize (v.)
"make hungry, give an appetite to," 1782 (implied in appetized), irregularly formed (on model of verbs in -ize) from appetite, or else a back-formation from appetizing. The French word is appétissant. "In Fr. only the pples. are found; and in English the simple vb. is perhaps only colloquial" [OED].
appetizer (n.)
"something taken to whet the appetite," 1820, agent noun from appetize.
appetizing (adj.)
"exciting desire or hunger," 1650s, from appetite on model of present participle adjective forms in -ing.
Appian Way
road between Rome and Capua, so called because it was begun (312 B.C.E.) by the censor Appius Claudius Caecus of the ancient gens of the Appii.
applaud (v.)
late 15c. (implied in applauding), "to express agreement or approval; to praise," from Latin applaudere "to clap the hands in approbation, to approve by clapping hands; to strike upon, beat," from assimilated form of ad "to" (see ad-) + plaudere "to clap" (see plaudit). The sense of "clap the hands" is from 1590s; the extended meaning arrived in English before literal. Related: Applauded.
applause (n.)
early 15c., "commendation, praise," from Latin applausus, past participle of applaudere "approve by clapping hands" (see applaud). English in 16c.-17c. had applausible "worthy to be applauded."
apple (n.)
Old English æppel "apple; any kind of fruit; fruit in general," from Proto-Germanic *ap(a)laz (source also of Old Saxon, Old Frisian, Dutch appel, Old Norse eple, Old High German apful, German Apfel), from PIE *ab(e)l- "apple" (source also of Gaulish avallo "fruit;" Old Irish ubull, Lithuanian obuolys, Old Church Slavonic jabloko "apple"), but the exact relation and original sense of these is uncertain (compare melon).
A roted eppel amang þe holen, makeþ rotie þe yzounde. ["Ayenbite of Inwit," 1340]
In Middle English and as late as 17c., it was a generic term for all fruit other than berries but including nuts (such as Old English fingeræppla "dates," literally "finger-apples;" Middle English appel of paradis "banana," c. 1400). Hence its grafting onto the unnamed "fruit of the forbidden tree" in Genesis. Cucumbers, in one Old English work, are eorþæppla, literally "earth-apples" (compare French pomme de terre "potato," literally "earth-apple;" see also melon). French pomme is from Latin pomum "apple; fruit" (see Pomona).
As far as the forbidden fruit is concerned, again, the Quran does not mention it explicitly, but according to traditional commentaries it was not an apple, as believed by Christians and Jews, but wheat. ["The Heart of Islam: Enduring Values for Humanity," Seyyed Hossein Nasr, 2002]
Apple of Discord (c. 1400) was thrown into the wedding of Thetis and Peleus by Eris (goddess of chaos and discord), who had not been invited, and inscribed kallisti "To the Prettiest One." Paris, elected to choose which goddess should have it, gave it to Aphrodite, offending Hera and Athene, with consequences of the Trojan War, etc.

Apple of one's eye (Old English), symbol of what is most cherished, was the pupil, supposed to be a globular solid body. Apple-polisher "one who curries favor" first attested 1928 in student slang. The image in the phrase upset the apple cart "spoil the undertaking" is attested from 1788. Road-apple "horse dropping" is from 1942.
apple-pie (n.)
1580s, from apple + pie; noted by 1893 as a typical American dish. Apple-pie bed as a name for a childish prank is recorded from 1781; supposedly from the way of making apple turnovers, but some think it a folk etymology of French nappe pliée "folded sheet."
apple-sauce (n.)
also applesauce, by 1739, American English, from apple + sauce (n.). Slang meaning "nonsense" is attested from 1921 and was noted as a vogue word early 1920s. Mencken credits it to cartoonist T.A. ("Tad") Dorgan. DAS suggests the word was thus used because applesauce was cheap fare served in boardinghouses.
apple-seed (n.)
1690s, from apple + seed (n.).
apple-tree (n.)
Old English æpeltreow; see apple + tree (n.).
applejack (n.)
also apple-jack, "apple-brandy, liquor distilled from cider," 1816, from apple + jack (n.).
applet (n.)
by 1995, a diminutive formation from application + -let.
appliance (n.)
1560s, "action of putting into use," from apply + -ance. Meaning "instrument, thing applied for a purpose" is from 1590s.
applicability (n.)
"capability of being used," 1650s, from applicable + -ity. Earlier was appliableness (1580s), now obsolete.
applicable (adj.)
1650s, "capable of being applied, suitable, appropriate," from Latin stem of apply (v.) + -able. Earlier in this sense was appliable (mid-15c.), and applicable formerly meant "pliable, well-disposed" (1560s).
applicant (n.)
"one who applies, candidate," late 15c., from Latin applicantem (nominative applicans), present participle of applicare "attach to, join, connect" (see apply).
application (n.)
early 15c., "the bringing of something to bear on something else," from Old French aplicacion (14c.), from Latin applicationem (nominative applicatio) "a joining to, an attaching oneself to; relation of a client to a patron," noun of action from past participle stem of applicare "attach to, join, connect," from ad "to" (see ad-) + plicare "to fold" (from PIE root *plek- "to plait").

Meaning "sincere hard effort" is from c. 1600. Meaning "a formal request to be hired for a job or paid position" is by 1851. Computer sense "program designed to carry out specific tasks or solve specific problems within a larger system" is a shortening of application program (1969).
applicator (n.)
1650s, agent noun from Latin stem of apply (v.).
applied (adj.)
"put to practical use," (as opposed to abstract or theoretical), 1650s, from past participle of apply. Earlier it was used in a sense of "folded" (c. 1500).