empty (adj.) Look up empty at Dictionary.com
c.1200, from Old English æmettig "at leisure, not occupied, unmarried," from æmetta "leisure," from æ "not" + -metta, from motan "to have" (see might (n.)). The -p- is a euphonic insertion.

Sense evolution from "at leisure" to "empty" is paralleled in several languages, such as Modern Greek adeios "empty," originally "freedom from fear," from deios "fear." "The adj. adeios must have been applied first to persons who enjoyed freedom from duties, leisure, and so were unoccupied, whence it was extended to objects that were unoccupied" [Buck].

The adjective also yielded a verb (1520s), replacing Middle English empten, from Old English geæmtigian. Related: Emptied; emptying. Figurative sense of empty-nester first attested 1987. Empty-handed attested from 1610s.
empyreal (adj.) Look up empyreal at Dictionary.com
late 15c.; see empyrean.
empyrean (n.) Look up empyrean at Dictionary.com
mid-14c. (as empyre), from Greek empyros "fiery," from en (see en- (2)) + pyr "fire" (see fire (n.)); confused by early writers with imperial. In Greek cosmology, the highest heaven, the sphere of pure fire; later baptized with a Christian gloss as "the abode of God and the angels."
emu (n.) Look up emu at Dictionary.com
"large Australian bird," 1610s, probably from Portuguese ema "crane, ostrich," of unknown origin.
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.
emulation (n.) Look up emulation at Dictionary.com
1550s, from Middle French émulation (13c.) and directly from Latin aemulationem (nominative aemulatio), 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, from root *aim- "copy" (see imitation).
emulator (n.) Look up emulator at Dictionary.com
1580s, from Latin aemulator, agent noun from aemulari (see emulation). Computer sense attested by 1965.
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" (see emulsion).
emulous (adj.) Look up emulous at Dictionary.com
late 14c., from Latin aemulus, from aemulari (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 emulsus, past participle 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), from emulsus, past participle of emulgere "to milk out," from 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 bloc Look up en bloc at Dictionary.com
French, literally "in a block."
en masse Look up en masse at Dictionary.com
French, literally "in mass."
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."
en suite Look up en suite at Dictionary.com
French, literally "as part of a series or set."
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 to -p-, -b-, -m-, -l-, and -r-.

Also used with native elements to form verbs from nouns and adjectives, "put in or on" (encircle), also "cause to be, make" (endear), and used as an intensive (enclose). Spelling variants in French that were brought over into Middle English account for parallels such as assure/ensure/insure.
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 with en- (1). Typically assimilated to -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.
enabler (n.) Look up enabler at Dictionary.com
1610s, agent noun from enable.
enact (v.) Look up enact at Dictionary.com
early 15c., from en- (1) "make, put in" + act (v.). Related: Enacted; enacting.
enactment (n.) Look up enactment at Dictionary.com
1817, from enact + -ment.
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; enameling.
enamel (n.) Look up enamel at Dictionary.com
early 15c., from enamel (v.).
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-, causative prefix (see en- (1)), + amour "love," from amare "to love" (see Amy). 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; for spelling, see -or. Related: Enamoured.
encamp (v.) Look up encamp at Dictionary.com
1560s, from en- (1) "make, put in" + camp (v.). Related: Encamped; encamping.
encampment (n.) Look up encampment at Dictionary.com
1590s, from encamp + -ment.
encapsulate (v.) Look up encapsulate at Dictionary.com
1842 (implied in encapsulated), from en- (1) "make, put in" + capsule + -ate (2)). Related: Encapsulating.
encapsulation (n.) Look up encapsulation at Dictionary.com
1859, noun of action from encapsulate.
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.); 1650s (adj.), from Greek enkaustikos, from enkaiein "to burn in" from en (see en- (2)) + kaiein "to burn" (see caustic).
enceinte (adj.) Look up enceinte at Dictionary.com
c.1600, insente, from French enceinte "pregnant" (12c.), from Late Latin incincta (source of Italian incinta), usually explained as "ungirt," from Latin in-, privative prefix (see in- (1)), + cincta, fem. of cinctus, past participle of cingere "to gird" (see cinch). Modern form is 18c., perhaps a reborrowing from French.
encephalitis (n.) Look up encephalitis at Dictionary.com
1843, from medical Latin encephalon (from Greek enkephalos "brain," literally "within the head," from en "in" + kephale "head;" see cephalo-) + -itis.
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 (see enchantment). Or perhaps a back-formation from enchantment. Related: Enchanting; enchantingly. Enchanted in weakened sense of "delighted" is from 1590s.
enchanter (n.) Look up enchanter at Dictionary.com
late 13c., agent noun from enchant or from Old French enchanteor.
enchantment (n.) Look up enchantment at Dictionary.com
late 13c., from Old French encantement, from enchanter "bewitch, charm," from Latin incantare, literally "enchant, cast a (magic) spell upon," from in- "upon, into" (see in- (2)) + cantare "to sing" (see chant (v.)). Figurative sense of "alluring" is from 1670s. Compare Old English galdor "song," also "spell, enchantment," from galan "to sing," 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.
enchilada (n.) Look up enchilada at Dictionary.com
1887, American English, from Mexican Spanish enchilada, fem. past participle of enchilar "season with chili," from en- "in" + chile "chili" (see chili).
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. Related: Encircled; encircling; encirclement.
enclave (n.) Look up enclave at Dictionary.com
1868, from French enclave, from Old French enclaver "enclose, comprise, include" (13c.), from Late Latin inclavare "shut in, lock up," from Latin in- "in" (see in- (2)) + clavis "key" (see slot (n.2)). Enclaved "surrounded by land owned by another" is attested in English from mid-15c., from Middle French enclaver.
enclitic Look up enclitic at Dictionary.com
1650s (adj.); 1660s (n.), from Late Latin encliticus, from Greek enklitikos "throwing its accent back," literally "leaning on," from verbal adjectival stem of enklinein "to bend, lean on," from en (see en- (2)) + klinein "to lean" (see lean (v.)).
enclose (v.) Look up enclose at Dictionary.com
early 14c., from en- (1) + close, and partially from Old French enclos, past participle of enclore.

Specific sense of "to fence in waste or common ground" for the purpose of cultivation or to give it to private owners, is from c.1500. Meaning "place a document with a letter for transmission" is from 1707. Related: Enclosed; enclosing.
enclosure (n.) Look up enclosure at Dictionary.com
mid-15c., "action of enclosing," from enclose + -ure. Meaning "that which is enclosed" is from 1550s.
encode (v.) Look up encode at Dictionary.com
1919, from en- (1) "make, put in" + code. Computing sense is from 1955, usually shortened colloquially to code. Related: Encoded; encoding.
encomiast (n.) Look up encomiast at Dictionary.com
c.1600, from Greek enkomiastes "one who praises," from enkomiazein, from enkomion (see encomium). Related: Encomiastic (1590s).