enclave (n.) Look up enclave at Dictionary.com
"small portion of one country which is entirely surrounded by the territory of another," 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 Old French enclaver.
enclitic Look up enclitic at Dictionary.com
1650s (adj.); 1660s (n.), in grammar, 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 "in" (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 "surround; confine; contain." 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
1917, from en- (1) "make, put in" + code (n.). Computing sense is from 1955, usually shortened colloquially or for clarity 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).
encomienda (n.) Look up encomienda at Dictionary.com
"estate granted to a Spaniard in America with powers to tax the Indians," 1810, from Spanish, literally "commission," from or related to encomendar "to commit, charge," from assimilated form of Latin in- "in" (see in- (2)) + Medieval Latin commendam, from Latin commendare "commit to one's care, commend" (see commend).
encomium (n.) Look up encomium at Dictionary.com
"discriminating expression of approval," 1580s, from Late Latin encomium, from Greek enkomion (epos) "laudatory (ode), eulogy," from en "in" (see en- (2)) + komos "banquet, procession, merrymaking" (see comedy).
encompass (v.) Look up encompass at Dictionary.com
1550s, from en- (1) "make, put in" + compass (n.). Related: Encompassed; encompasses; encompassing.
encore (interj.) Look up encore at Dictionary.com
1712, from French encore "still, yet, again, also, furthermore" (12c.), generally explained as being from Vulgar Latin phrase *hinc ad horam "from then to this hour," or (in) hanc horam "(to) this hour" (Italian ancora "again, still, yet" is said to be a French loan-word).
Whenever any Gentlemen are particularly pleased with a Song, at their crying out Encore ... the Performer is so obliging as to sing it over again. [Steele, "Spectator" No. 314, 1712]

There appears to be no evidence that either the Fr. or It. word was ever similarly used in its native country. The corresponding word both in Fr. and It. is bis; in It. da capo was formerly used. [OED]
As a noun, from 1763; as a verb, from 1748. Related: Encored.
encounter (n.) Look up encounter at Dictionary.com
c. 1300, "meeting of adversaries, confrontation," from Old French encontre "meeting; fight; opportunity" (12c.), noun use of preposition/adverb encontre "against, counter to" from Late Latin incontra "in front of," from Latin in- "in" (see in- (2)) + contra "against" (see contra). Modern use of the word in psychology is from 1967, from the work of U.S. psychologist Carl Rogers (1902-1987). Encounter group attested from 1967.
encounter (v.) Look up encounter at Dictionary.com
c. 1300, "to meet as an adversary," from Old French encontrer "meet, come across; confront, fight, oppose," from encontre (see encounter (n.)). Weakened sense of "meet casually or unexpectedly" first recorded in English early 16c. Related: Encountered; encountering.
encourage (v.) Look up encourage at Dictionary.com
early 15c., from Old French encoragier "make strong, hearten," from en- "make, put in" (see en- (1)) + corage "courage, heart" (see courage). Related: Encouraged; encouraging; encouragingly.
encouragement (n.) Look up encouragement at Dictionary.com
1560s, from encourage + -ment, or from Middle French encoragement.
As a general rule, Providence seldom vouchsafes to mortals any more than just that degree of encouragement which suffices to keep them at a reasonably full exertion of their powers. [Hawthorne, "House of Seven Gables"]
encrease Look up encrease at Dictionary.com
obsolete or archaic form of increase.
encroach (v.) Look up encroach at Dictionary.com
late 14c., "acquire, get," from Old French encrochier "seize, fasten on, hang on (to), cling (to); hang up, suspend," literally "to catch with a hook," from en- "in" (see en- (1)) + croc "hook," from Old Norse krokr "hook" (see crook (n.)). Sense extended to "seize wrongfully" (c. 1400), then "trespass" (1530s). Related: Encroached; encroaches; encroaching.
encroachment (n.) Look up encroachment at Dictionary.com
mid-15c., "obtruding structure," from encroach + -ment, or an equivalent Old French compound.
encrust (v.) Look up encrust at Dictionary.com
also incrust, 1640s, from Middle French encruster, incruster (Modern French encroûter), from Latin incrustare "to coat or cover with crust," from in- (see in- (2)) + crusta (see crust (n.)). Related: Encrusted; encrusting.
encrypt (v.) Look up encrypt at Dictionary.com
1968 in telecommunications, a back-formation from encryption (1964), or from en- (1) + crypt (n.) on the notion of "hidden place" (see crypto-). Related: Encrypted; encrypting.
enculturation (n.) Look up enculturation at Dictionary.com
1948 (Herskovits), from en- (1) + culturation (compare acculturation).
encumber (v.) Look up encumber at Dictionary.com
early 14c., "burden, vex, inconvenience," from Old French encombrer "to block up, hinder, thwart," from Late Latin incombrare, from in- "in" (see in- (2)) + combrus "barricade, obstacle," probably from Latin cumulus "heap" (see cumulus). Meaning "hinder, hamper" is attested in English from late 14c. Related: Encumbered; encumbering.
encumbrance (n.) Look up encumbrance at Dictionary.com
c. 1300, "trouble, difficulty; ensnarement, temptation," from Old French encombrance "encumbrance, obstruction; calamity, trouble," from encombrer (see encumber). Meaning "that which encumbers, impediment, obstacle" is from late 14c. in English.
encyclical (adj.) Look up encyclical at Dictionary.com
in reference to ecclesiastical letters meant for wide circulation (for example, a letter sent by a pope to all bishops), 1640s, from Late Latin encyclicus, from Latin encyclius, from Greek enkyklios "in a circle, circular" (see encyclopedia). As a noun, from 1837.
encyclopaedia (n.) Look up encyclopaedia at Dictionary.com
see encyclopedia. The Latin spelling survives as a variant because many of the most prominent ones (such as Britannica) have Latin names.
encyclopedia (n.) Look up encyclopedia at Dictionary.com
1530s, "general course of instruction," from Modern Latin encyclopaedia (c. 1500), thought to be a false reading by Latin authors of Greek enkyklios paideia taken as "general education," but literally "training in a circle," i.e. the "circle" of arts and sciences, the essentials of a liberal education; from enkyklios "circular," also "general" (from en "in;" see in + kyklos "circle;" see cycle (n.)) + paideia "education, child-rearing," from pais (genitive paidos) "child" (see pedo-).

Modern sense of "reference work arranged alphabetically" is from 1640s, often applied specifically to the French "Encyclopédie ou Dictionnaire raisonné des Sciences, des Arts, et des Métiers" (1751-65). Related: Encyclopedist.
encyclopedic (adj.) Look up encyclopedic at Dictionary.com
1816, from encyclopedia + -ic.
end (n.) Look up end at Dictionary.com
Old English ende "end, conclusion, boundary, district, species, class," from Proto-Germanic *andja (cognates: Old Frisian enda, Old Dutch ende, Dutch einde, Old Norse endir "end;" Old High German enti "top, forehead, end," German Ende, Gothic andeis "end"), originally "the opposite side," from PIE *antjo "end, boundary," from root *ant- "opposite, in front of, before" (see ante).
Worldly wealth he cared not for, desiring onely to make both ends meet. [Thomas Fuller, "The History of the Worthies of England," 1662]
Original sense of "outermost part" is obsolete except in phrase ends of the earth. Sense of "destruction, death" was in Old English. Meaning "division or quarter of a town" was in Old English. The end "the last straw, the limit" (in a disparaging sense) is from 1929. The end-man in minstrel troupes was one of the two at the ends of the semicircle of performers, who told funny stories and cracked jokes with the middle-man. U.S. football end zone is from 1909 (end for "side of the field occupied by one team" is from 1851). The noun phrase end-run is attested from 1893 in U.S. football; extended to military tactics by 1940. End time in reference to the end of the world is from 1917. To end it all "commit suicide" is attested by 1911. Be-all and end-all is from Shakespeare ("Macbeth" I.vii.5).
end (v.) Look up end at Dictionary.com
Old English endian "to end, finish, abolish, destroy; come to an end, die," from the source of end (n.). Related: Ended; ending.
end-paper (n.) Look up end-paper at Dictionary.com
in book-binding, "blank leaves before and after the text of a book," 1818, from end (n.) + paper (n.).
endanger (v.) Look up endanger at Dictionary.com
late 15c., from en- (1) "make, put in" + danger. Related: Endangered; endangering. Endangered species recorded by 1958.
endangerment (n.) Look up endangerment at Dictionary.com
1640s (Milton), from endanger + -ment. Earlier was endangering (1580s).
endear (v.) Look up endear at Dictionary.com
1580s, "to enhance the value of," also "win the affection of," from en- (1) "make, put in" + dear (adj.). Meaning "to make dear," the main modern sense, is from 1640s. Related: Endeared; endearing.
endearing (adj.) Look up endearing at Dictionary.com
1660s, present participle adjective from endear. Related: Endearingly.
endearment (n.) Look up endearment at Dictionary.com
"act of endearing," 1610s, from endear + -ment. Meaning "obligation of gratitude" is from 1620s; that of "action expressive of love" is from 1702.
endeavor (n.) Look up endeavor at Dictionary.com
early 15c., "pains taken to attain an object," literally "in duty," from phrase put (oneself) in dever "make it one's duty" (a partial translation of Old French mettre en deveir "put in duty"), from Old French dever "duty," from Latin debere "to owe" (see debt). One's endeavors meaning one's "utmost effort" is from late 15c.
endeavor (v.) Look up endeavor at Dictionary.com
c. 1400, from phrase put in dever (see endeavor (n.)). Related: Endeavored; endeavoring.
endeavour Look up endeavour at Dictionary.com
chiefly British English spelling of endeavor (q.v.); for spelling, see -or. Related: Endeavoured; endeavoring; endeavours. The U.S. space shuttle was spelled this way because it was named for the HMS Endeavour, Capt. Cook's ship.
ended (adj.) Look up ended at Dictionary.com
"finished, completed," 1590s, past participle adjective from end (v.).
endemic (adj.) Look up endemic at Dictionary.com
"particular to a people or locality," 1650s (endemical), with -ic + Greek endemos "native, dwelling in (a place), of or belonging to a people," from en "in" (see en- (2)) + demos "people, district" (see demotic). From 1660s as a noun.
endgame (n.) Look up endgame at Dictionary.com
also end-game, 1850, in chess, from end + game (n.). There is no formal or exact definition of it in chess, but it begins when most of the pieces have been cleared from the board.
ending (n.) Look up ending at Dictionary.com
"a coming to an end," early 14c., verbal noun from end (v.). Meaning "the end part (of something)" is from c. 1400. Old English had endunge "ending, end, death."
endive (n.) Look up endive at Dictionary.com
late 14c., from Old French endive (14c.), from Medieval Latin endivia or a related Romanic source, from Latin intibus. This probably is connected in some way with Medieval Greek entybon, which Klein says is perhaps of Eastern origin (compare Egyptian tybi "January," the time the plant grows in Egypt). Century Dictionary says Arabic hindiba is "appar. of European origin."
endless (adj.) Look up endless at Dictionary.com
Old English endeleas "boundless, eternal;" see end (n.) + -less. Compare Old Saxon endilos, Dutch eindeloos, German endlos. Related: Endlessly; endlessness. Old English used endeleasnes for "infinity, eternity."
endlong (prep., adv.) Look up endlong at Dictionary.com
c. 1200, "from end to end, lengthwise; through or over the length of," from Old English andlang "from end to end, lengthwise" (see along) with Middle English substitution of ende (see end (n.)) for first element. Meaning "at full length, horizontally" is from early 15c. In Middle English frequently paired with overthwart and together meaning "lengthwise and crosswise," hence "in all directions."
endmost (adj.) Look up endmost at Dictionary.com
1725, from end (n.) + -most. Middle English had endemest (adv.) "from end to end, throughout."
endo- Look up endo- at Dictionary.com
word-forming element meaning "inside, within, internal," comb. form of Greek endon "in, within," from PIE *en-do-, extended form of root *en "in" (see in).
endocrine (adj.) Look up endocrine at Dictionary.com
"secreting internally," 1914, from endo- + Latinized form of Greek krinein "to separate, distinguish" (see crisis). Denoting glands having an internal secretion.
endocrinology (n.) Look up endocrinology at Dictionary.com
1917, from endocrine + -ology. Related: Endocrinologist.
endoderm (n.) Look up endoderm at Dictionary.com
1835, from endo- + -derm. Coined by Prussian embryologist Robert Remak (1815-1865).
endogamy (n.) Look up endogamy at Dictionary.com
"marriage within the tribe or group," 1865, from endo- on model of polygamy. Related: Endogamous (1865). Opposed to exogamy. Apparently both were coined by Scottish anthropologist John Ferguson McLennan (1827-1881) in "Primitive Marriage."
To this law, the converse of caste, forbidding marriage within the tribe, Mr. M'Lennan has given the name of exogamy: while, instead of caste, since that word involves notions unconnected with marriage, he has used the correlative word -- endogamy. [review in "The Lancet," March 25, 1865]