enlighten (v.) Look up enlighten at Dictionary.com
late 14c., "to remove the dimness or blindness (usually figurative) from one's eyes or heart;" see en- (1) + lighten. Old English had inlihtan. Related: Enlightened; enlightening.
enlightened (adj.) Look up enlightened at Dictionary.com
1630s, "illuminated;" 1660s in the sense "well-informed;" past participle adjective from enlighten.
enlightenment (n.) Look up enlightenment at Dictionary.com
1660s, "action of enlightening," from enlighten + -ment. Used only in figurative sense, of spiritual enlightenment, etc. Attested from 1865 as a translation of German Aufklärung, a name for the spirit and system of Continental philosophers in the 18c.
The philosophy of the Enlightenment insisted on man's essential autonomy: man is responsible to himself, to his own rational interests, to his self-development, and, by an inescapable extension, to the welfare of his fellow man. For the philosophes, man was not a sinner, at least not by nature; human nature -- and this argument was subversive, in fact revolutionary, in their day -- is by origin good, or at least neutral. Despite the undeniable power of man's antisocial passions, therefore, the individual may hope for improvement through his own efforts -- through education, participation in politics, activity in behalf of reform, but not through prayer. [Peter Gay, "The Enlightenment"]
enlist (v.) Look up enlist at Dictionary.com
1590s, from en- (1) "make, put in" + list (n.). Possibly suggested by Dutch inlijsten "to write on a list." Related: Enlisted; enlisting.
enlistment (n.) Look up enlistment at Dictionary.com
1765, from enlist + -ment.
enliven (v.) Look up enliven at Dictionary.com
1630s, "give life to" (enlive in same sense is from 1590s); see en- (1) "make, put in" + life + -en (1). Meaning "make lively or cheerful" is from 1690s. Related: Enlivened; enlivening.
enmesh (v.) Look up enmesh at Dictionary.com
c.1600, from en- (1) + mesh (v.). Related: Enmeshed; enmeshing.
enmity (n.) Look up enmity at Dictionary.com
late 14c., from Old French enemistié "enmity, hostile act, aversion," from Vulgar Latin *inimicitatem (nominative *inimicitas), from Latin inimicitia "enmity, hostility," from inimicus "enemy" (see enemy). Related: Enmities.
ennead (n.) Look up ennead at Dictionary.com
"group of nine things," 1650s, from Greek enneas (genitive enneados) "group of nine," from ennea "nine" (see nine).
ennoble (v.) Look up ennoble at Dictionary.com
late 15c. (implied in ennobled), from Middle French ennoblir; see en- (1) + noble (adj.). Related: Ennobling.
ennui (n.) Look up ennui at Dictionary.com
1660s as a French word in English; nativized by 1758; from French ennui, from Old French enui "annoyance" (13c.), back-formation from enuier (see annoy). Hence ennuyé "afflicted with ennui;" ennuyée a woman so afflicted.
So far as frequency of use is concerned, the word might be regarded as fully naturalized; but the pronunciation has not been anglicized, there being in fact no Eng. analogy which could serve as a guide. [OED]
Enoch Look up Enoch at Dictionary.com
masc. proper name, in Old Testament eldest son of Cain, father of Methuselah, from Latin Enoch, from Greek Enokh, from Hebrew Hanokh, literally "dedicated, consecrated," from hanakh "he dedicated," whence also Hanukkah.
enormity (n.) Look up enormity at Dictionary.com
late 15c., "transgression, crime, irregularity," from Old French énormité "extravagance, enormity, atrocity, heinous sin," from Latin enormitatem (nominative enormitas) "hugeness, vastness, irregularity," from enormis (see enormous). Meaning "extreme wickedness" in English attested from 1560s; sense of "hugeness" (1792) is etymological but probably best avoided to prevent misunderstanding.
enormous (adj.) Look up enormous at Dictionary.com
1530s, from Latin enormis "out of rule, irregular, shapeless; extraordinary, very large," from ex- "out of" (see ex-) + norma "rule, norm" (see norm), with English -ous substituted for Latin -is.

Meaning "extraordinary in size" is attested from 1540s; original sense of "outrageous" is more clearly preserved in enormity. Earlier in same sense was enormyous (mid-15c.). Related: Enormously.
Enos Look up Enos at Dictionary.com
masc. proper name, in Old Testament the son of Seth, from Greek Enos, from Hebrew Enosh, literally "man" (compare nashim "women," Arabic ins "men, people").
enough (adj.) Look up enough at Dictionary.com
c.1300, from Old English genog, a common Germanic formation (cognates: Old Saxon ginog, Old Frisian enoch, Dutch genoeg, Old High German ginuog, German genug, Old Norse gnogr, Gothic ganohs).

This is a compound of ge- "with, together" (also a participial, collective, intensive, or perfective prefix) + root -nah, from PIE *nek- (2) "to reach, attain" (cognates: Sanskrit asnoti "reaches," Hittite ninikzi "lifts, raises," Lithuanian nešti "to bear, carry," Latin nancisci "to obtain"). It is the most prominent among the surviving examples of Old English ge-, the equivalent of Latin com- and Modern German ge-, from PIE *kom- "beside, near, by, with" (see com-).

Meaning "moderately, fairly, tolerably" (good enough) was in Middle English. Understated sense of have had enough "have had too much" was in Old English (which relied heavily on double negatives and understatement). Colloquial 'nough said is attested from 1839.
enow (adj., n.) Look up enow at Dictionary.com
Old English genoge (plural adjective); see enough. Until 18c., regarded as standard as the plural of enough.
enquire (v.) Look up enquire at Dictionary.com
see inquire. An alternative form mainly used in sense of "to ask a question." Related: enquired; enquiring.
enquiry (n.) Look up enquiry at Dictionary.com
alternative spelling of inquiry. Related: Enquiries.
enrage (v.) Look up enrage at Dictionary.com
late 14c. (implied in enraged), from Old French enragier "go wild, go mad, lose one's senses," from en- "make, put in" (see en- (1)) + rage "rabies, rage" (see rage (n.)). Related: Enraging. Intransitive only in Old French; transitive sense is oldest in English.
enrapt (adj.) Look up enrapt at Dictionary.com
c.1600, "carried away by (prophetic) ecstasy," past participle adjective from en- "make, put in" (see en- (1)) + rapt.
enrapture (v.) Look up enrapture at Dictionary.com
1740, from en- (1) + rapture (n.). Related: Enraptured.
enrich (v.) Look up enrich at Dictionary.com
late 14c., "to make wealthy," from Old French enrichir "enrich, enlarge," from en- "make, put in" (see en- (1)) + riche "rich" (see rich).

Figurative sense is from 1590s. Scientific sense of "to increase the abundance of a particular isotope in some material" is first attested 1945. Related: Enriched; enriching.
enrichment (n.) Look up enrichment at Dictionary.com
1620s, from enrich + -ment.
enrol (v.) Look up enrol at Dictionary.com
alternative spelling of enroll.
enroll (v.) Look up enroll at Dictionary.com
mid-14c., from Old French enroller "record in a register" (13c., Modern French enrôler), from en- "make, put in" (see en- (1)) + rolle (see roll (n.)). Related: Enrolled; enrolling.
enrollment (n.) Look up enrollment at Dictionary.com
also enrolment, mid-15c., from Anglo-French enrollement, from Middle French enrollement, from Old French enroller "record in a register" (see enroll).
ensample (n.) Look up ensample at Dictionary.com
"precedent," c.1300, variant of asaumple, from Old French essample "example" (see example). The survival of this variant form is due to its use in New Testament in KJV.
ensconce (v.) Look up ensconce at Dictionary.com
1580s, "to cover with a fort," from en- (1) "make, put in" + sconce "small fortification, shelter," perhaps via French, probably from Dutch schans "earthwork" (compare Middle High German schanze "bundle of sticks"), of uncertain origin. Related: Ensconced.
ensemble (n.) Look up ensemble at Dictionary.com
mid-15c., as an adverb, "together, at the same time," from Middle French ensemblée "all the parts of a thing considered together," from Late Latin insimul "at the same time," from in- intensive prefix + simul "at the same time," related to similis (see similar). The noun is from 1703, "parts of a thing taken together;" musical sense in English first attested 1844. Of women's dress and accessories, from 1927.
enshrine (v.) Look up enshrine at Dictionary.com
1580s, from en- (1) "make, put in" + shrine. Related: Enshrined; enshrining.
enshroud (v.) Look up enshroud at Dictionary.com
1580s, from en- (1) "make, put in" + shroud (n.). Related: Enshrouded; enshrouding.
ensign (n.) Look up ensign at Dictionary.com
late 14c., via Scottish, from Old French enseigne (12c.) "mark, symbol, signal; flag, standard, pennant," from Latin insignia (plural); see insignia. Sense of "banner, flag" is c.1400; that of soldier who carries one is first recorded 1510s. U.S. Navy sense of "commissioned officer of the lowest rank" is from 1862. French navy had rank of enseigne de vaisseau since at least early 18c.
enslave (v.) Look up enslave at Dictionary.com
1640s, from en- (1) "make, put in" + slave (n.). Related: Enslaved; enslaving.
enslavement (n.) Look up enslavement at Dictionary.com
1690s, from enslave + -ment.
ensnare (v.) Look up ensnare at Dictionary.com
1570s, from en- (1) "make, put in" + snare (n.). Related: Ensnared; ensnaring.
ensue (v.) Look up ensue at Dictionary.com
late 14c., from Old French ensu-, past participle stem of ensivre "follow close upon, come afterward," from Late Latin insequere, from Latin insequi "to pursue, follow, follow after; come next," from in- "upon" (see in- (2)) + sequi "follow" (see sequel). Related: Ensued; ensues; ensuing.
ensure (v.) Look up ensure at Dictionary.com
late 14c., from Anglo-French enseurer, from en- "make" (see en- (1)) + Old French seur "sure" (see sure); probably influenced by Old French asseurer "assure." Related: Ensured; ensures; ensuring.
entablature (n.) Look up entablature at Dictionary.com
1610s, nativization of Italian intavolatura; see en- (1) + tablature.
entail (v.) Look up entail at Dictionary.com
mid-14c., "convert (an estate) into 'fee tail' (feudum talliatum)," from en- (1) "make" + taile "legal limitation," especially of inheritance, ruling who succeeds in ownership and preventing it from being sold off, from Anglo-French taile, Old French taillie, past participle of taillier "allot, cut to shape," from Late Latin taliare. Sense of "have consequences" is 1829, from notion of "inseparable connection." Related: Entailed; entailling.
entangle (v.) Look up entangle at Dictionary.com
early 15c., from en- (1) + tangle (n.). Related: Entangled; entangling.
entanglement (n.) Look up entanglement at Dictionary.com
1640s, from entangle + -ment. Foreign entanglements does not appear as such in Washington's Farewell Address, though he nonetheless warns against them. The phrase is found in William Coxe's 1798 memoirs of Sir Robert Walpole.
entelechy (n.) Look up entelechy at Dictionary.com
c.1600, from Greek entelekheia, from en "in" (see en- (2)) + telei, dative of telos "perfection" (see tele-) + ekhein "to have" (see scheme (n.)). In Aristotle, "the condition in which a potentiality has become an actuality."
entente (n.) Look up entente at Dictionary.com
1854, from French éntente "understanding," from Old French entente "intent" (12c.), noun use of fem. past participle of entendre "to direct one's attention (see intent). Political sense arose in 19c. from entente cordial (1844), the best-known example being that between England and France (1904), to which Russia was added in 1908.
enter (v.) Look up enter at Dictionary.com
late 13c., from Old French entrer, from Latin intrare "to go into, enter" (source of Spanish entrar, Italian entrare), from intra "within," related to inter (prep., adj.) "among, between" (see inter-). Related: Entered; entering.
enteric (adj.) Look up enteric at Dictionary.com
"pertaining to the intestines," 1869, from Greek enterikos "intestinal," first used in this sense by Aristotle, from entera (plural; singular enteron) "intestines," from PIE *enter-, comparative of *en "in" (see inter-).
enteritis (n.) Look up enteritis at Dictionary.com
1808, medical Latin, coined c.1750 by French pathologist François-Boissier de la Croix de Sauvages (1706-1767), from enteron "intestine" (see enteric) + -itis.
entero- Look up entero- at Dictionary.com
before vowels enter-, word-forming element meaning "intestine," from comb. form of Greek enteron "an intestine, piece of gut" (see enteric).
enterovirus (n.) Look up enterovirus at Dictionary.com
1957; see entero- + virus.
enterprise (n.) Look up enterprise at Dictionary.com
early 15c., "an undertaking," from Old French enterprise "an undertaking," noun use of fem. past participle of entreprendre "undertake, take in hand," from entre- "between" (see entre-) + prendre "to take," contraction of prehendere (see prehensile). Abstract sense of "readiness to undertake challenges, spirit of daring" is from late 15c.