Etymology
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affect (v.1)
"to make a mental impression on," 1630s; earlier "to attack" (c. 1600), "act upon, infect" (early 15c.), from affect (n.) or from Latin affectus "disposition, mood, state of mind or body produced by some external influence." Related: Affected; affecting. "The two verbs, with their derivatives, run into each other, and cannot be completely separated" [Century Dictionary].
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affect (n.)
late 14c., "mental state," from Latin affectus "disposition, mood, state of mind or body produced by some external influence," noun use of adjective affectus "disposed, constituted, inclined," literally "furnished, supplied, endowed," past participle of afficere "to do; treat, use, manage, handle; act on, do something to; attack with disease; have influence on, apply force to," a verb used of many different actions, literally "to do to," from ad "to" (see ad-) + facere (past participle factus) "to make, do" (from PIE root *dhe- "to set, put"). Perhaps obsolete outside of psychology, where it is a modern coinage, translating German Affekt. Related: Affects.
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affect (v.2)
"to make a pretense of," 1660s, earlier "to assume the character of (someone)," 1590s; originally in English in a now-obsolete sense "aim at, aspire to, desire" (early 15c.), from Old French afecter (15c.), later affecter, from Latin affectare "to strive after, aim at, aspire to," frequentative of afficere (past participle affectus) "to do something to, act on, influence" (see affect (n.)). Related: Affected; affecting.
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affecting (adj.)
"having power to move or excite the feelings," 1720, present-participle adjective from affect (v.1).
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affected (adj.1)
"artificially displayed," 1580s, past-participle adjective from affect (v.2) "make a pretense of." Related: Affectedly.
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affected (adj.2)
1530s, "favorably disposed" (now obsolete but preserved in disaffected), past-participle adjective from affect (v.1). From 1610s as "under the influence of, afflicted."
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affectation (n.)

"studied display, artificiality of manner or conduct," 1540s, from French affectation (16c.) or directly from Latin affectationem (nominative affectatio) "a striving after, a claiming," noun of action from past-participle stem of affectare "to strive for" (see affect (v.2)).

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disaffect (v.)

1620s, "lack affection for" (a sense now obsolete); 1640s, "alienate the affection of, make less friendly" (the main modern sense), from dis- + affect (v.1). Related: Disaffected; disaffecting.

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unaffected (adj.)
1580s, "not influenced, untouched in mind or feeling," from un- (1) "not" + past participle of affect (v.). Meaning "not adopted or assumed, genuine" is recorded from 1590s; that of "not acted upon or altered (by something)" is first attested 1830. Related: Unaffectedly; unaffectedness.
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aficionado (n.)
1845, from Spanish aficionado "amateur," specifically "devotee of bullfighting," literally "fond of," from afición "affection," from Latin affectionem "relation, disposition," noun of state from past participle stem of afficere "do something" (see affect (n.)). "Most sources derive this word from the Spanish verb aficionar but the verb does not appear in Spanish before 1555, and the word aficionado is recorded in the 1400's" [Barnhart]. In English, originally of devotees of bullfighting; in non-restricted use by 1882.
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