entitlement (n.) Look up entitlement at Dictionary.com
1823, perhaps in some senses from French entitlement, which was in Old French as "tit;e (of a book), inscription," and later was used in legal language; but also in part a native formation from entitle + -ment. Entitlement culture attested by 1994 (culture of entitlement is from 1989).
entity (n.) Look up entity at Dictionary.com
1590s, from Late Latin entitatem (nominative entitas), from ens (genitive entis) "a thing," proposed by Caesar as present participle of esse "be" (see is), to render Greek philosophical term to on "that which is" (from neuter of present participle of einai "to be;" see essence). Originally abstract; concrete sense in English is from 1620s.
ento- Look up ento- at Dictionary.com
word-forming element used chiefly in biology and meaning "within, inside, inner," from Greek ento-, comb. form of entos (adv., prep.) "within, inside," as a noun, "inner parts" (cognate with Latin intus), from PIE *entos, from *en "in" (see in) + adverbial suffix -tos, denoting origin.
entomb (v.) Look up entomb at Dictionary.com
1570s, from Old French entomber "place in a tomb," from en- "in" (see en- (1)) + tombe "tomb" (see tomb). Related: Entombed; entombing. The earlier verb was simply tomb (c.1300).
entombment (n.) Look up entombment at Dictionary.com
1660s, from entomb + -ment.
entomolite (n.) Look up entomolite at Dictionary.com
"fossilized insect," 1813, from entomo-, comb. form of Greek entomon "insect" (see entomology) + -lite "stone." Late 18c. in French and German.
entomologist (n.) Look up entomologist at Dictionary.com
1771; see entomology + -ist.
entomology (n.) Look up entomology at Dictionary.com
1764, from French entomologie (1764), coined from -logie "study of" (see -logy) + Greek entomon "insect," neuter of entomos "cut in pieces, cut up," in this case "having a notch or cut (at the waist)," from en "in" (see en- (2)) + temnein "to cut" (see tome).

Insects were so called by Aristotle in reference to the segmented division of their bodies. Compare insect, which is from a Latin loan-translation of the Greek word. Related: Entomological; entomologically. Hybrid insectology (1766, from French insectologie, 1744) is not much used.
I have given the name insectology to that part of natural history which has insects for its object; that of entomology ... would undoubtedly have been more suitable ... but its barbarous sound terryfy'd me. [Charles Bonnet's English translation of his "Contemplation de la nature," 1766]
entomophagous (adj.) Look up entomophagous at Dictionary.com
"insectivorous," 1800, from entomo-, comb. form of Greek entomon "insect" (see entomology) + -phagous.
entoparasite (n.) Look up entoparasite at Dictionary.com
1847; see ento- + parasite. Perhaps from German or French.
entourage (n.) Look up entourage at Dictionary.com
1832, "surroundings, environment," picked up by De Quincey from French entourage, from Middle French entourer "to surround" (16c.), from Old French entour "that which surrounds" (10c.), from en- "in" (see en- (1)) + tour "a circuit" (see tour). Specific sense of "attendant persons, persons among whom as followers or companions one is accustomed to move" recorded in English by 1860.
entrails (n.) Look up entrails at Dictionary.com
"internal parts of animal bodies," c.1300, from Old French entrailles (12c.), from Late Latin intralia "inward parts, intestines" (8c.), from altered form of Latin interanea, noun use of neuter plural of interaneus "internal, that which is within," from inter "between, among" (see inter-). Latin interanea yielded Late Latin intrania, hence Italian entrango, Spanish entrañas, Old French entraigne; the alternative form that led to the Modern English word evidently is from influence of the Latin neuter plural (collective) adjective suffix -alia (French -aille).
entrain (v.1) Look up entrain at Dictionary.com
"to draw along," 1560s, a term in chemistry, from French entrainer (12c.), from en- "away" (see en- (1)) + trainer "to drag" (see train (n.)). Related: Entrained; entrainment.
entrain (v.2) Look up entrain at Dictionary.com
"get on board a locomotive train," 1860s, from en- (1) "in, into" + train (n.). Related: Entrained.
entrammel (v.) Look up entrammel at Dictionary.com
"to entangle," 1590s, from en- (1) "in" + trammel (n.).
entrance (n.) Look up entrance at Dictionary.com
1520s, "act of entering," from Middle French entrance, from entrer (see enter). Sense of "door, gate" first recorded in English 1530s. Meaning "a coming of an actor upon the stage" is from c.1600.
entrance (v.) Look up entrance at Dictionary.com
"to throw into a trance," 1590s, from en- (1) "put in" + trance (n.). Meaning "to delight" also is 1590s. Related: Entranced; entrancing; entrancement.
entrant (n.) Look up entrant at Dictionary.com
1630s, "one who enters, a beginner" (of professions, etc.); from French entrant, present participle of entrer (see enter). From 1838 with reference to one who enters a contest. As an adjective from 1630s.
entrap (v.) Look up entrap at Dictionary.com
"to catch, as in a trap," 1530s, intrappe, from Old French entraper "trap, catch in a trap;" see en- (1) + trap (n.). Related: Entrapped; entrapping.
entrapment (n.) Look up entrapment at Dictionary.com
1590s, from entrap + -ment. Criminal investigation sense attested by 1896.
entre nous Look up entre nous at Dictionary.com
"in private," French, literally "between ourselves."
entre- Look up entre- at Dictionary.com
in words from French, corresponds to English enter-, which is itself from French entre "between, among" (11c.), from Latin inter (see inter-).
entreat (v.) Look up entreat at Dictionary.com
c.1400, "to enter into negotiations," especially "discuss or arrange peace terms;" also "to treat (someone) in a certain way," from Anglo-French entretier, Old French entraiter "to treat," from en- "make" (see en- (1)) + traiter "to treat" (see treat (v.)). Meaning "to beseech, implore, plead with (someone)" is from early 15c.; meaning "to plead for (someone)" is from mid-15c. Related: Entreated; entreating.
entreaty (n.) Look up entreaty at Dictionary.com
mid-15c., "treatment; negotiation;" see entreat + -y (1). Meaning "urgent solicitation, earnest request" is from 1570s. Related: Entreaties.
entree (n.) Look up entree at Dictionary.com
1724, "opening piece of an opera or ballet," from French entrée, from Old French entree (see entry). Cookery sense is from 1759; originally the dish which was introductory to the main course. Meaning "entry, freedom of access" is from 1762. The word had been borrowed in Middle English as entre "act of entering."
entrench (v.) Look up entrench at Dictionary.com
also intrench, 1550s, implied in intrenched, from en- (1) "make, put in" + trench (n.). Figurative use is from 1590s. Related: Entrenched; entrenching.
entrenchment (n.) Look up entrenchment at Dictionary.com
also intrenchment, 1580s, from entrench + -ment.
entrepot (n.) Look up entrepot at Dictionary.com
"warehouse," 1758, from French entrepôt (16c.), from Latin interpositum "that which is placed between," neuter past participle of interponere "to place between" (see interposition).
entrepreneur (n.) Look up entrepreneur at Dictionary.com
1828, "manager or promoter of a theatrical production," reborrowing of French entrepreneur "one who undertakes or manages," agent noun from Old French entreprendre "undertake" (see enterprise). The word first crossed the Channel late 15c. (Middle English entreprenour) but did not stay. Meaning "business manager" is from 1852. Related: Entrepreneurship.
entrepreneurial (adj.) Look up entrepreneurial at Dictionary.com
1915, from entrepreneur + -ial.
entropy (n.) Look up entropy at Dictionary.com
1868, from German Entropie "measure of the disorder of a system," coined 1865 (on analogy of Energie) by German physicist Rudolph Clausius (1822-1888), in his work on the laws of thermodynamics, from Greek entropia "a turning toward," from en "in" (see en- (2)) + trope "a turning, a transformation" (see trope). The notion is supposed to be "transformation contents." Related: Entropic.
It was not until 1865 that Clausius invented the word entropy as a suitable name for what he had been calling "the transformational content of the body." The new word made it possible to state the second law in the brief but portentous form: "The entropy of the universe tends toward a maximum," but Clausius did not view entropy as the basic concept for understanding that law. He preferred to express the physical meaning of the second law in terms of the concept of disgregation, another word that he coined, a concept that never became part of the accepted structure of thermodynamics. [Martin J. Klein, "The Scientific Style of Josiah Willard Gibbs," in "A Century of Nathematics in America," 1989]
entrust (v.) Look up entrust at Dictionary.com
also intrust, c.1600, from en- (1) "make, put in" + trust (n.). Related: Entrusted; entrusting.
entry (n.) Look up entry at Dictionary.com
c.1300, "act or fact of physically entering; place of entrance, means of entering a building; opportunity or right of entering; initiation or beginning of an action;" from Old French entree "entry, entrance" (12c.), noun use of fem. past participle of entrer "to enter" (see enter). Meaning "that which is entered or set down (in a book, list, etc.)" is from c.1500.
entryway (n.) Look up entryway at Dictionary.com
1746, from entry + way.
entwine (v.) Look up entwine at Dictionary.com
also intwine, 1590s, from en- (1) "make, put in" + twine (n.). Related: Entwined; entwining.
enucleation (n.) Look up enucleation at Dictionary.com
1640s, noun of action from verb enucleate (1540s), from Latin enucleatus "pure, clean," past participle of enucleare "to lay open, explain in detail," literally "to remove the kernel from" (see ex- + nucleus). Mostly figurative in Latin (the notion is of getting at the "core" of some matter), and usually figurative in English until mid-19c. advances in science and medicine gave it a new literal sense.
enumerable (adj.) Look up enumerable at Dictionary.com
1846; see enumerate + -able. Often an error for innumerable.
enumerate (v.) Look up enumerate at Dictionary.com
1640s, from or modeled on Latin enumeratus, past participle of enumerare (see enumeration). Middle English had annumerate (early 15c.). Related: Enumerated; enumerating.
enumeration (n.) Look up enumeration at Dictionary.com
1550s, "action of enumerating," from Middle French énumération, from Latin enumerationem (nominative enumeratio) "a counting up," noun of action from past participle stem of enumerare "to reckon up, count over, enumerate," from assimilated form of ex- "from" (see ex-) + numerare "to count, number," from numerus "number" (see number (n.)). Meaning "a list, catalogue" is from 1724.
enunciate (v.) Look up enunciate at Dictionary.com
1620s, "declare, express," from Latin enunciatus, properly enuntiatus, past participle of enuntiare "speak out, say, express, assert; divulge, disclose, reveal, betray," from assimilated form of ex- "out" (see ex-) + nuntiare "to announce" (see nuncio). Or perhaps a back-formation from enunciation. Meaning "to articulate, pronounce" is from 1759. Related: Enunciated; enunciating.
enunciation (n.) Look up enunciation at Dictionary.com
1550s, "a declaration," from Latin enuntiationem (nominative enuntiatio) "enunciation, declaration," noun of action from past participle stem of enuntiare "to speak out, say, express" (see enunciate). Meaning "articulation of words" is from 1750.
enunciative (adj.) Look up enunciative at Dictionary.com
"declarative, declaring something as true," 1530s, from Latin enunciatus, properly enuntiativus, from past participle stem of enuntiare "to speak out, say, express" (see enunciate).
enuresis (n.) Look up enuresis at Dictionary.com
minor urinary incontinence, 1800, medical Latin, from Greek enourein "to urinate in," from en "in" (see en- (2)) + ourein "to urinate," from ouron (see urine).
envelop (v.) Look up envelop at Dictionary.com
late 14c., envolupen, "be involved" (in sin, crime, etc.), from Old French envoleper "envelop, cover; fold up, wrap up" (10c., Modern French envelopper), from en- "in" (see en- (1)) + voloper "wrap up," of uncertain origin, perhaps Celtic (see Gamillscheg, Diez) or Germanic ("Century Dictionary"). Literal sense is from 1580s. Related: Enveloped; enveloping.
envelope (n.) Look up envelope at Dictionary.com
"a wrapper, an enclosing cover," specifically a prepared wrapper for a letter or other paper, 1705, from French enveloppe (13c.), a back-formation from envelopper "to envelop" (see envelop).
envelopment (n.) Look up envelopment at Dictionary.com
1751, from envelop (v.) + -ment.
envenom (v.) Look up envenom at Dictionary.com
c.1300, envenymen, from Old French envenimer (12c.) "to poison, taint;" from en- (see en- (1)) + venim (see venom). Figurative use is from late 14c. Related: Envenomed; envenoming.
enviable (adj.) Look up enviable at Dictionary.com
c.1600, from envy + -able or from French enviable. Related: Enviably.
envious (adj.) Look up envious at Dictionary.com
c.1300, from Anglo-French envious, Old French envieus (13c.), earlier envidius "envious, jealous" (12c., Modern French envieux), from Latin invidiosus "full of envy" (source of Spanish envidioso, Italian invidioso, Portuguese invejoso), from invidia (see envy). Related: Enviously; enviousness.
environ (v.) Look up environ at Dictionary.com
late 14c. (implied in environing), "to surround, encircle, encompass," from Old French environer "to surround, enclose, encircle," from environ "round about," from en- "in" (see en- (1)) + viron "a circle, circuit," also used as an adverb, from virer "to turn" (see veer). Related: Environed.