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allegory (n.)[allegory 词源字典]: late 14c., from Old French allegorie (12c.), from Latin allegoria, from Greek allegoria "figurative language, description of one thing under the image of another," literally "a speaking about something else," from allos "another, different" (see alias (adv.)) + agoreuein "speak openly, speak in the assembly," from agora "assembly" (see agora).[allegory etymology, allegory origin, 英语词源]
allegretto: 1740, from Italian allegretto, diminutive of allegro (q.v.).
allegro: 1680s as a musical term, from Italian allegro "cheerful, gay," from Latin alacrem (nominative alacer) "lively, cheerful, brisk" (see alacrity).
allele (n.): 1931, from German allel, abbreviation of allelomorph (1902), coined from Greek allel- "one another" (from allos "other;" see alias (adv.)) + morphe "form" (see Morpheus).
alleluia: late 14c., from Latin alleluja, from Greek allelouia, from Hebrew hallelu-yah "praise Jehovah" (see hallelujah).
allemande (n.): a German dance, 1775, from French Allemande, fem. of allemand "German" (see Alemanni). As a move in country or square dancing, from 1808.
Allen: masc. proper name, variant of Alan (q.v.). In reference to wrench, key, screw, etc. with hexagonal socket or head, 1913, from the Allen Manufacturing Company of Hartford, Connecticut, U.S.
allergen (n.): substance causing allergy, 1912, from allergy on model of antigen.
allergic (adj.): 1911, from allergy + -ic; perhaps modeled on French allergique (1906). Figurative use, "antipathetic, repulsed" is from 1936.
allergy (n.): 1911, from German Allergie, coined 1906 by Austrian pediatrician Clemens E. von Pirquet (1874-1929) from Greek allos "other, different, strange" (see alias (adv.)) + ergon "activity" (see organ).
alleviate (v.): late 15c., from Middle French allevier or directly from Late Latin alleviatus, past participle of alleviare "to lighten," from Latin ad- "to" (see ad-) + levis "light" in weight (see lever). Related: Alleviated; alleviating.
alleviation (n.): early 15c., from Middle French aleviacion or directly from Medieval Latin alleviationem (nominative alleviatio), noun of action from past participle stem of alleviare (see alleviate).
alley (n.): mid-14c., "passage in a house; open passage between buildings; walkway in a garden," from Old French alee (13c., Modern French allée) "a path, passage, way, corridor," also "a going," from fem. of ale, past participle of aler "to go," which ultimately may be a contraction of Latin ambulare "to walk," or from Gallo-Roman allari, a back-formation from Latin allatus "having been brought to" [Barnhart]. Compare sense evolution of gate. Applied by c. 1500 to "long narrow enclosure for playing at bowls, skittles, etc." Used in place names from c. 1500.

The word is applied in American English to what in London is called a mews, and also is used there especially of a back-lane parallel to a main street (1729). To be up someone's alley "in someone's neighborhood" (literally or figuratively) is from 1931; alley-cat attested by 1890.
alley-way (n.): 1788, from alley + way (n.).
alliance (n.): c. 1300, "bond of marriage" (between ruling houses or noble families), from Old French aliance (12c., Modern French alliance) "alliance, bond; marriage, union," from aliier (Modern French allier) "combine, unite" (see ally (v.)). As a bond or treaty between rulers, late 14c.
allied (adj.): c. 1300, past participle adjective from ally (v.). Originally of kindred; in reference to a league or formal treaty, it is first recorded late 14c.
alligator (n.): 1560s, lagarto (modern form attested from 1620s, with excrescent -r as in tater, feller, etc.), a corruption of Spanish el lagarto (de Indias) "the lizard (of the Indies)," from Latin lacertus (see lizard). Alligarter was an early variant. The slang meaning "non-playing devotee of swing music" is attested from 1936; the phrase see you later, alligator is from a 1956 song title.
Allison: fem. proper name, a diminutive of Alice (q.v.), via Old French Alison. Popular in U.S. as a girl's name from 1990s, but all but unknown there before 1946; it was popular in England and Scotland 13c.-17c. As a surname, it could represent "Alice's son."
alliterate (v.): "to use alliteration," 1776 (implied in alliterated), back-formation from alliteration, on analogy of obliterate. Related: Alliterating.
alliteration (n.): 1650s, "a begining with the same letter," from Modern Latin alliterationem (nominative alliteratio), noun of action from past participle stem of alliterare "to begin with the same letter," from Latin ad- "to" (see ad-) + littera (also litera) "letter, script" (see letter). Formed on model of obliteration, etc. Related: Alliterational.