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Original sense of "outermost part" is obsolete except in phrase ends of the earth.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).
endoskeleton (n.) Look up endoskeleton at Dictionary.com
1838, from endo- + skeleton.
endosperm (n.) Look up endosperm at Dictionary.com
1819, perhaps from German, from endo- + sperm.
endospore (n.) Look up endospore at Dictionary.com
1859, perhaps from French, from endo- + spore.
endothermic (adj.) Look up endothermic at Dictionary.com
1884, from French endothermique (1879); see endo- + thermal.
endow (v.) Look up endow at Dictionary.com
late 14c., indowen "provide an income for," from Anglo-French endover, from en- "in" + Old French douer "endow," from Latin dotare "bestow" (see dowry). Related: Endowed; endowing.
endowed (adj.) Look up endowed at Dictionary.com
1700, past participle adjective from endow.
endowment (n.) Look up endowment at Dictionary.com
mid-15c., "action of endowing," from endow + -ment. Meaning "property with which an institution or person is endowed" is from 1590s; that of "gift, power, advantage" is early 17c.
endpoint (n.) Look up endpoint at Dictionary.com
also end-point, 1899, originally in chemistry, from end + point (n.). General use from 1920s.
endue (v.) Look up endue at Dictionary.com
also indue, c.1400, from Old French enduire "lead, drive, initiate, indoctrinate" (12c.), from Latin inducere "to lead" (see induce). Related: Endued.
endurable (adj.) Look up endurable at Dictionary.com
c.1600, "able to endure," from endure + -able. Meaning "able to be endured" is from c.1800. Related: Endurably.
endurance (n.) Look up endurance at Dictionary.com
late 15c., "continued existence in time;" see endure + -ance. Meaning "ability to endure suffering, etc." is from 1660s.
endure (v.) Look up endure at Dictionary.com
early 14c., "to undergo or suffer" (especially without breaking); late 14c. "to continue in existence," from Old French endurer (12c.) "make hard, harden; bear, tolerate; keep up, maintain," from Latin indurare "make hard," in Late Latin "harden (the heart) against," from in- (see in- (2)) + durare "to harden," from durus "hard," from PIE *dru-ro-, from root *deru- "be firm, solid, steadfast" (see true).

Replaced the important Old English verb dreogan (past tense dreag, past participle drogen), which survives in dialectal dree. Related: Endured; endures.
enduring Look up enduring at Dictionary.com
late 14c., action of the verb endure; as a present participle adjective meaning "lasting," from 1530s.
Endymion Look up Endymion at Dictionary.com
beautiful youth loved by Moon-goddess Selene, from Greek, perhaps literally "diver, plunger," from endyein "to enter into, sink into, plunge, dive," which was used in reference to the sun or stars setting into the sea. On this theory, he originally was a solar deity, a personification of the setting sun.
enema (n.) Look up enema at Dictionary.com
early 15c., via Medieval Latin, from Greek enema "injection," from enienai "to send in, inject," from en "in" (see en- (2)) + hienai "send" (cognate of Latin iacere; see jet (v.)).
enemy (n.) Look up enemy at Dictionary.com
early 13c., from Old French enemi (12c.), earlier inimi (9c.) "enemy, adversary, foe, demon, the Devil," from Latin inimicus "hostile, unfriendly; an enemy" (source of Italian nemico, Catalan enamic, Spanish enemigo, Portuguese inimigo), from in- "not" (see in- (1)) + amicus "friend" related to amare "to love" (see Amy).

Most words for "personal enemy" cover also "enemy in war," but certain languages have special terms for the latter, such as Greek polemioi (distinct from ekhthroi), Latin hostis, originally "stranger" (distinct from inimicus), Russian neprijatel' (distinct from vrag).

Russian vrag (Old Church Slavonic vragu) is cognate with Lithuanian vargas "misery" (see urge (v.)), and probably is related to Proto-Germanic *wargoz, source of Old Norse vargr "outlaw," hence "wolf;" Icelandic vargur "fox," Old English wearg "criminal, felon;" which likely were the inspirations for J.R.R. Tolkien's warg "a kind of large ferocious wolf" in "The Hobbit" (1937) and "Lord of the Rings." Related: Enemies.
energetic (adj.) Look up energetic at Dictionary.com
1650s, "powerful," from Greek energetikos "active," from energein "to work, act upon" (see energy). Of persons, "active," in English from 1796 (energetical is from c.1600).
energize (v.) Look up energize at Dictionary.com
1751; see energy + -ize. Related: Energized; energizing.