empyrean (n.) Look up empyrean at Dictionary.com
mid-14c. (as empyre), probably via Medieval Latin empyreus, from Greek empyros "fiery," from assimilated form of en (see en- (2)) + pyr "fire," from PIE root *paəwr- "fire" (see fire (n.)). As an adjective in English from early 15c. The etymological sense is "formed of pure fire or light." In ancient Greek cosmology, the highest heaven, the sphere of pure fire; later baptized with a Christian sense of "abode of God and the angels."
emu (n.) Look up emu at Dictionary.com
large Australian three-toed bird, 1610s, probably from Portuguese ema "crane, ostrich" (which is of unknown origin), perhaps based on a folk-etymology of a native name.
emulate (v.) Look up emulate at Dictionary.com
1580s, back-formation from emulation, or else from Latin aemulatus, past participle of aemulari "to rival." Related: Emulated; emulating; emulable; emulative.
emulation (n.) Look up emulation at Dictionary.com
1550s, from Middle French émulation (13c.) and directly from Latin aemulationem (nominative aemulatio) "rivalry, emulation, competition," noun of action from past participle stem of aemulari "to rival, strive to excel," from aemulus "striving, rivaling" (also as a noun, "a rival," fem. aemula), from Proto-Italic *aimo-, from PIE *aim-olo, suffixed form of root *aim- "copy" (see imitation).
emulator (n.) Look up emulator at Dictionary.com
1580s, "rival, competitor," from Latin aemulator "a zealous imitator, imitative rival," agent noun from aemulari "to rival" (see emulation). The meaning "imitative rival" in English is from 1650s.
emulgent Look up emulgent at Dictionary.com
1570s (adj.), 1610s (n.), from Latin emulgentem (nominative emulgens), present participle of emulgere "to milk out, drain out, exhaust" (see emulsion). Related: Emulgence.
emulous (adj.) Look up emulous at Dictionary.com
"desirous of equaling or excelling," late 14c., from Latin aemulus "striving, rivaling," in a bad sense "envious, jealous," from aemulari "to rival" (see emulation). Related: Emulously.
emulsification (n.) Look up emulsification at Dictionary.com
1858, noun of action from emulsify.
emulsifier (n.) Look up emulsifier at Dictionary.com
1872, agent noun from emulsify.
emulsify (v.) Look up emulsify at Dictionary.com
1853, from Latin emuls-, past participle stem of emulgere "to milk out" (see emulsion) + -fy. Related: emulsified.
emulsion (n.) Look up emulsion at Dictionary.com
1610s, from French émulsion (16c.), from Modern Latin emulsionem (nominative emulsio), noun of action from past participle stem of emulgere "to milk out," from assimilated form of ex- "out" (see ex-) + mulgere "to milk" (see milk (n.)). Milk is a classic instance of an emulsion, drops of one liquid dispersed throughout another.
en (n.) Look up en at Dictionary.com
name of the letter "N;" in printing (1793), a space half as wide as an em.
en (prep.) Look up en at Dictionary.com
French, "in; as," from Latin in (see in).
en bloc Look up en bloc at Dictionary.com
French, literally "in a block" (see block (n.)).
en masse Look up en masse at Dictionary.com
French, literally "in mass" (see mass (n.1)).
en passant Look up en passant at Dictionary.com
French, literally "in passing," from present participle of passer "to pass" (see pass (v.)). In reference to chess, first attested 1818.
en route Look up en route at Dictionary.com
1779, French, literally "on the way" (see route (n.)).
en suite Look up en suite at Dictionary.com
French, literally "as part of a series or set" (see suite (n.)).
en- (1) Look up en- at Dictionary.com
word-forming element meaning "in; into," from French and Old French en-, from Latin in- "in, into" (see in- (2)). Typically assimilated before -p-, -b-, -m-, -l-, and -r-. Latin in- became en- in French, Spanish, Portuguese, but remained in- in Italian.

Also used with native and imported elements to form verbs from nouns and adjectives, with a sense "put in or on" (encircle), also "cause to be, make into" (endear), and used as an intensive (enclose). Spelling variants in French that were brought over into Middle English account for parallels such as ensure/insure, and most en- words in English had at one time or another a variant in in-, and vice versa.
en- (2) Look up en- at Dictionary.com
word-forming element meaning "near, at, in, on, within," from Greek en "in," cognate with Latin in (see in), and thus with en- (1). Typically assimilated to em- before -p-, -b-, -m-, -l-, and -r-.
enable (v.) Look up enable at Dictionary.com
early 15c., "to make fit;" mid-15c., "to make able to," from en- (1) "make, put in" + able. Related: Enabled; enabling. An enabling act (1684) is so called because it empowers a body or person to take certain action.
enabler (n.) Look up enabler at Dictionary.com
1610s, agent noun from enable.
enact (v.) Look up enact at Dictionary.com
early 15c., "act the part of, represent in performance," from en- (1) "make, put in" + act (v.). Meaning "decree, establish, sanction into law" is from mid-15c. Related: Enacted; enacting.
enactment (n.) Look up enactment at Dictionary.com
1766, "passing of a bill into law," from enact + -ment. Meaning "a law, statute" is by 1783. Earlier was enaction 1620s.
enamel (v.) Look up enamel at Dictionary.com
early 14c., from Anglo-French enamailler (early 14c.), from en- "in" (see en- (1)) + amailler "to enamel," variant of Old French esmailler, from esmal "enamel," from Frankish *smalt, from Proto-Germanic *smaltjan "to smelt" (see smelt (v.)). Related: Enameled; enameler; enameling.
enamel (n.) Look up enamel at Dictionary.com
early 15c., in ceramics, from enamel (v.). As "hardest part of a tooth," 1718, from a use in French émail.
enamor (v.) Look up enamor at Dictionary.com
c. 1300, from Old French enamorer "to fall in love with; to inspire love" (12c., Modern French enamourer), from en- "in, into" (see en- (1)) + amor "love," from amare "to love" (see Amy). Since earliest appearance in English, it has been used chiefly in the past participle (enamored) and with of or with. An equivalent formation to Provençal, Spanish, Portuguese enamorar, Italian innamorare.
enamored (adj.) Look up enamored at Dictionary.com
1630s, past participle adjective from enamor.
enamour (v.) Look up enamour at Dictionary.com
chiefly British English form of enamor, but also common in America and given preference of spelling in some American dictionaries; for spelling, see -or. Related: Enamoured.
encamp (v.) Look up encamp at Dictionary.com
1560s, "go into camp, settle in temporary quarters," from en- (1) "make, put in" + camp (n.). Related: Encamped; encamping.
encampment (n.) Look up encampment at Dictionary.com
1590s, "place where a camp is formed," from encamp + -ment. From 1680s as "act of forming a camp."
encapsulate (v.) Look up encapsulate at Dictionary.com
1842 (implied in encapsulated), "enclose in a capsule," from en- (1) "make, put in" + capsule + -ate (2). Figurative use by 1939. Related: Encapsulating.
encapsulation (n.) Look up encapsulation at Dictionary.com
1859, "act of surrounding with a capsule," noun of action from encapsulate. Figurative use by 1934.
encase (v.) Look up encase at Dictionary.com
1630s, from en- (1) "make, put in" + case (n.2). Related: Encased; encasing.
encaustic Look up encaustic at Dictionary.com
c. 1600 (n.), "art of encaustic painting;" 1650s (adj.) "produced by burning in," from Greek enkaustikos, from enkaiein "to burn in" from en (see en- (2)) + kaiein "to burn" (see caustic). "Strictly applicable only to painting executed or finished by the agency of heat" [Century Dictionary].
enceinte (adj.) Look up enceinte at Dictionary.com
"pregnant, with child," c. 1600, insente, from French enceinte "pregnant" (12c.), from Late Latin incincta (source of Italian incinta), explained by Isidore of Seville (7c.) as "ungirt," from Latin in-, privative prefix (see in- (1)), + cincta, fem. of cinctus, past participle of cingere "to gird" (see cinch). But perhaps the Late Latin word is from past participle of Latin incingere "to put into a girdle" (that is, "to make (a woman) pregnant"), with in- (2) "in, into." Modern form is 18c., perhaps a reborrowing from French.
encephalitis (n.) Look up encephalitis at Dictionary.com
"inflammation of the brain," 1843, from encephalo- "the brain" + -itis "inflammation." Related: Encephalitic.
encephalo- Look up encephalo- at Dictionary.com
before vowels encephal-, word-forming element meaning "brain, of the brain," from comb. form of medical Latin encephalon, from Greek enkephalos "the brain," literally "within the head," from en "in" (see en- (2)) + kephale "head;" see cephalo-.
enchain (v.) Look up enchain at Dictionary.com
late 14c., "become linked together;" mid-15c., "to secure with a chain," from Old French enchainer, from Medieval Latin incatenare "enchain," from in (see in) + catenare, from catena "a chain" (see chain (n.)). Related: Enchained; enchaining.
enchant (v.) Look up enchant at Dictionary.com
late 14c., literal and figurative, from Old French enchanter "bewitch, charm, cast a spell" (12c.), from Latin incantare "to enchant, fix a spell upon" (see enchantment). Or perhaps a back-formation from enchantment.
enchanted (adj.) Look up enchanted at Dictionary.com
"delighted," 1590s, past participle adjective from enchant (v.).
enchanter (n.) Look up enchanter at Dictionary.com
late 13c., agent noun from enchant, or from Old French enchanteor "magician; singer; mountebank," from Latin incantator.
enchanting (adj.) Look up enchanting at Dictionary.com
1590s, "having magical power," present participle adjective from enchant (v.). Meaning "bewitched" is from 1712. Related: Enchantingly.
enchantment (n.) Look up enchantment at Dictionary.com
c. 1300, "act of magic or witchcraft; use of magic; magic power," from Old French encantement "magical spell; song, concert, chorus," from enchanter "bewitch, charm," from Latin incantare "enchant, cast a (magic) spell upon," from in- "upon, into" (see in- (2)) + cantare "to sing" (see chant (v.)). Figurative sense of "allurement" is from 1670s. Compare Old English galdor "song," also "spell, enchantment," from galan "to sing," which also is the source of the second element in nightingale.
enchantress (n.) Look up enchantress at Dictionary.com
late 14c., "witch," from enchanter + -ess. Meaning "charming woman" is from 1713.
encharge (v.) Look up encharge at Dictionary.com
late 14c., "impose (something) as a duty or obligation," from Old French enchargier, from Medieval Latin incaricare "load, charge," from in- "in" (see in- (2)) + caricare "to load," from Vulgar Latin carricare "to load a car" (see charge (v.)).
enchilada (n.) Look up enchilada at Dictionary.com
1876, American English, from Mexican Spanish enchilada, fem. past participle of enchilar "season with chili," from en- "in" + chile "chili" (see chili).
"You never ate enchilada, did you? I hope you never will. An enchilada looks not unlike an ordinary flannel cake rolled on itself and covered with molasses. The ingredients which go to make it up are pepper, lye, hominy, pepper, onions chopped fine, pepper, grated cheese, and pepper. ["The Health Reformer," December 1876]
enchiridion (n.) Look up enchiridion at Dictionary.com
1540s, "a handbook," from Late Latin, from Greek enkheiridion, neuter of enkheiridios "that which is held in the hand," from en "in" (see en- (2)) + kheir "hand" (see chiro-) + diminutive suffix -idion.
encircle (v.) Look up encircle at Dictionary.com
c. 1400, from en- (1) "make, put in" + circle (n.). Related: Encircled; encircling.
encirclement (n.) Look up encirclement at Dictionary.com
1809, from encircle + -ment.