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).
encomienda (n.) Look up encomienda at Dictionary.com
1810, from Spanish, "commission," from encomendar "to commit, charge." Estate granted to a Spaniard in America with powers to tax the Indians.
encomium (n.) Look up encomium at Dictionary.com
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. Related: Encompassed; encompasses; encompassing.
encore (interj.) Look up encore at Dictionary.com
1712, from French encore "still, yet, again" (12c.), generally explained as being from Vulgar Latin phrase *hinc ad horam "from then 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.
encounter (n.) Look up encounter at Dictionary.com
c.1300, "meeting of adversaries, confrontation," from Old French encontre "meeting; fight; opportunity," 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 "confront," from encontre (see encounter (n.). Weakened sense of "casually meet" 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 (see courage). Related: Encouraged; encouraging.
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"]
encroach (v.) Look up encroach at Dictionary.com
early 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). Meaning "seize wrongfully" is from c.1400. Sense of "trespass" is first recorded 1530s. Related: Encroached; encroaches; encroaching.
encroachment (n.) Look up encroachment at Dictionary.com
1520s, from encroach + -ment. In Anglo-French from mid-15c.
encrust (v.) Look up encrust at Dictionary.com
1640s, from French incruster, from Latin incrustare "to cover with crust," from in- (see in- (2)) + crusta (see crust). Related: Encrusted; encrusting.
encrypt (v.) Look up encrypt at Dictionary.com
1975 in computer sense, from en- (1) + crypt (see crypto-). Related: Encrypted; encrypting; encryption.
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." Meaning "hinder, hamper" is attested in English from late 14c. Related: Encumbered; encumbering.
encumbrance (n.) Look up encumbrance at Dictionary.com
early 14c., from Old French encombrance, from encombrer (see encumber).
encyclical (adj.) Look up encyclical at Dictionary.com
in reference to a letter sent by the Pope to all the 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, "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" + kyklos "circle") + 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).
encyclopedic (adj.) Look up encyclopedic at Dictionary.com
1824, 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).

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 phrase end run is first attested 1902 in U.S. football; extended to military tactics in World War II; general figurative sense is from 1968. 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).
Worldly wealth he cared not for, desiring onely to make both ends meet. [Thomas Fuller, "The History of the Worthies of England," 1662]
end (v.) Look up end at Dictionary.com
Old English endian, from the source of end (n.). Related: Ended; ending.
endanger (v.) Look up endanger at Dictionary.com
late 15c., from en- (1) "make, put in" + danger. Related: Endangered; endangering. Endangered species first recorded 1964.
endangerment (n.) Look up endangerment at Dictionary.com
1640s, from endanger + -ment.
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" 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; 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.
ended (adj.) Look up ended at Dictionary.com
"finished, completed," 1590s, past participle adjective from end (v.).
endemic (n.) Look up endemic at Dictionary.com
1660s, from Greek endemos "native, dwelling in (a place), of or belonging to a people" (from en "in;" see en- (2) + demos "people, district;" see demotic) + -ic. From 1759 as an adjective. Endemical is attested from 1650s.
endgame (n.) Look up endgame at Dictionary.com
1884, from 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," Old English endunge, verbal noun from end (v.).
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. Probably 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).
endless (adj.) Look up endless at Dictionary.com
Old English endeleas; see end (n.) + -less. Related: Endlessly. Old English used endeleasnes for "infinity, eternity."
endlong (adv.) Look up endlong at Dictionary.com
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." As a preposition c.1200. see along.
endo- Look up endo- at Dictionary.com
word-forming element meaning "inside, within, internal," comb. form of Greek endon "in, within," literally "in the house of," from en "in" (see en- (2)) + base of domos "house" (see domestic).
endocrine (adj.) Look up endocrine at Dictionary.com
"secretly, internally," 1914, from endo- + Latinized form of Greek krinein "to separate, distinguish" (see crisis).
endocrinology (n.) Look up endocrinology at Dictionary.com
1919, 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
1865, from endogamous (1865); for which see endo- + gamete.
endogenous (adj.) Look up endogenous at Dictionary.com
1830, from endo- "within" + -genous "producing."
endometrium (n.) Look up endometrium at Dictionary.com
1882, medical Latin, from endo- + Greek metra "uterus," related to meter (see mother (n.1)).
endomorph (n.) Look up endomorph at Dictionary.com
1940 as one of W.H. Sheldon's three types of human bodies, from endo- + Greek morphe "form" (see Morpheus). Related: Endomorphic.
endorphin (n.) Look up endorphin at Dictionary.com
1975, from French endorphine, from endogène "endogenous, growing within" (see endo- + genus) + (mo)rphine.
endorse (v.) Look up endorse at Dictionary.com
late 14c. endosse "alteration," from Old French endosser (12c.), literally "to put on back," from en- "put on" (see en- (1)) + dos "back," from Latin dossum, variant of dorsum.

Sense of "confirm, approve" (by signing on the back) is recorded in English first in 1847. Assimilated 16c. in form to Medieval Latin indorsare. Related: Endorsed; endorsing.
You can endorse, literally, a cheque or other papers, &, metaphorically, a claim or argument, but to talk of endorsing material things other than papers is a solecism. [Fowler]
endorsement (n.) Look up endorsement at Dictionary.com
1540s, from endorse + -ment. Earlier endosement (early 15c.).
endoscopy (n.) Look up endoscopy at Dictionary.com
1861, from endo- + -oscopy (see -scope).