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aping (n.)[aping 词源字典]: "imitation, mimicry," 1680s, verbal noun from ape (v.).[aping etymology, aping origin, 英语词源]
aplasia (n.): 1885, medical Latin, from Greek a-, privative prefix (see a- (3)), + -plasia.
aplenty (adj.): 1830, originally U.S., from a- (1) + plenty (n.). First attested in writings of J. Fenimore Cooper.
aplomb (n.): "assurance, confidence," 1828, from French aplomb (16c.), literally "perpendicularity," from phrase à plomb "poised upright, balanced," literally "on the plumb line," from Latin plumbum "(the metal) lead" (see plumb (n.)), of which the weight at the end of the line was made.
apnea (n.): "suspension of breathing," also apnoea, 1719, Modern Latin, from Greek apnoia "absence of respiration," from apnos "without breathing," from a- "not" (see a- (3)) + pnein "to breathe" (see pneuma).
apneic (adj.): 1883, from apnea + -ic.
apo koinu: Greek, literally "in common." Applied to sentences with one subject and two predicates; a formation rare in modern English, though it occurs more often in Old English. Compare koine.
apo-: before vowels ap-, word-forming element meaning "from, away from, separate, free from," from Greek apo "from, away from; after; in descent from," in compounds, "from, asunder, away, off; finishing, completing; ceasing from; back again," from PIE root *apo- "off, away" (cognates: Sanskrit apa "away from," Avestan apa "away from," Latin ab "away from, from," Gothic af, Old English of "away from").
apocalypse (n.): late 14c., "revelation, disclosure," from Church Latin apocalypsis "revelation," from Greek apokalyptein "uncover, disclose, reveal," from apo- "from" (see apo-) + kalyptein "to cover, conceal" (see Calypso). The Christian end-of-the-world story is part of the revelation in John of Patmos' book "Apokalypsis" (a title rendered into English as "Apocalypse" c. 1230 and "Revelations" by Wyclif c. 1380).

Its general sense in Middle English was "insight, vision; hallucination;" meaning "a cataclysmic event" is modern. As agent nouns, apocalypst (1829), apocalypt (1834), and apocalyptist (1835) have been tried.
apocalyptic (adj.): 1660s, "pertaining to the 'Revelation of St. John' in the New Testament," from Greek apokalyptikos, from apokalyptein (see apocalypse). Meaning "pertaining to the imminent end of the world" evolved by 1880s.
Apocrypha: late 14c., neuter plural of Late Latin apocryphus "secret, not approved for public reading," from Greek apokryphos "hidden; obscure," thus "(books) of unknown authorship" (especially those included in the Septuagint and Vulgate but not originally written in Hebrew and not counted as genuine by the Jews), from apo- "away" (see apo-) + kryptein "to hide" (see crypt). Properly plural (the single would be Apocryphon or apocryphum), but commonly treated as a collective singular.
apocryphal (adj.): 1580s, "of doubtful authenticity," from Apocrypha + -al (1). Middle English had apocrive (late 14c.) in same sense.
apodal (adj.): 1769, with -al + Greek apous (genitive apodos) "footless," from a-, privative prefix (see a- (3)) + pous "foot," from PIE root *ped- (1) "a foot" (see foot (n.)).
apodictic (adj.): "clearly demonstrated," 1650s, from Latin apodicticus, from Greek apodeiktikos, from apodeiktos, verbal adjective of apodeiknynai "to show off, demonstrate," literally "to point away from" (other objects, at one), from apo "off, away" (see apo-) + deiknynai "to show" (see diction).
apodyterium (n.): 1690s, from Latin apodyterium "undressing room" (in a bath house), from Greek apodyterion "undressing room," from apodyein "to put off, undress," from apo- "off" (see apo-) + dyein "to put on, enter, go in."
apogee (n.): "point at which the moon is farthest from the earth," 1590s, from French apogée, from Latin apogaeum, from Greek apogaion, neuter adjective, "away from the earth," a term from Ptolemaic astronomy, from apo "off, away" (see apo-) + gaia/ge "earth" (see Gaia). Adjective forms are apogeal, apogean.
apolitical (adj.): 1947, from a- "not" (see a- (3)) + political.
Apollo: Olympian deity, god of music, poetry, medicine, etc., later identified with Helios, the sun god; the name is a Latin form of Greek Apollon, said to be perhaps related to an obsolete Greek verb meaning "to drive away" (evil, etc.) [Klein, citing Usener].
Apollonian (adj.): 1660s, from Apollo (Greek Apollon) + -ian. The Greek adjective was Apollonios. The word also is attested in English as Apollinarian (1753), Apolline (c. 1600).
Apollyon: destroying angel of the bottomless pit (a name sometimes given to the Devil), late 14c., from present participle of Greek apollyein "to destroy utterly" (from apo- "from, away from" + olluein "to destroy"); a translation of Hebrew Abaddon (q.v.).