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to act on; produce an effect or change in:
Cold weather affected the crops.
to impress the mind or move the feelings of:
The music affected him deeply.
(of pain, disease, etc.) to attack or lay hold of.
Psychology. feeling or emotion.
Psychiatry. an expressed or observed emotional response:
Restricted, flat, or blunted affect may be a symptom of mental illness, especially schizophrenia.
Obsolete, ; passion; sensation; inclination; inward disposition or feeling.
Historical Examples

They are too affectable, too susceptible to sudden changes of mood.
How to Analyze People on Sight Elsie Lincoln Benedict and Ralph Paine Benedict

Neither honour nor artistic personality is affectable by external considerations which are on a different plane of value.
Recent Developments in European Thought Various

verb (transitive) (əˈfɛkt)
to act upon or influence, esp in an adverse way: damp affected the sparking plugs
to move or disturb emotionally or mentally: her death affected him greatly
(of pain, disease, etc) to attack
noun (ˈæfɛkt; əˈfɛkt)
(psychol) the emotion associated with an idea or set of ideas See also affection
verb (mainly transitive)
to put on an appearance or show of; make a pretence of: to affect ignorance
to imitate or assume, esp pretentiously: to affect an accent
to have or use by preference: she always affects funereal clothing
to adopt the character, manner, etc, of: he was always affecting the politician
(of plants or animals) to live or grow in: penguins affect an arctic climate
to incline naturally or habitually towards: falling drops of liquid affect roundness
n.

late 14c., “mental state,” from Latin noun use of affectus “furnished, supplied, endowed,” figuratively “disposed, constituted, inclined,” past participle of afficere “to do; treat, use, manage, handle; act on; have influence on, do something to,” a verb of broad meaning, from ad- “to” (see ad-) + facere (past participle factus) “do” (see factitious). Perhaps obsolete except in psychology. Related: Affects.
v.

“to make an impression on,” 1630s; earlier “to attack” (c.1600), “act upon, infect” (early 15c.), from affect (n.). Related: Affected; affecting.

“to make a pretense of,” 1660s, earlier “to assume the character of (someone)” (1590s); originally in English “to aim at, aspire to, desire” (early 15c.), from Middle French affecter (15c.), from Latin affectare “to strive after, aim at,” frequentative of afficere (past participle affectus) “to do something to, act on” (see affect (n.)). Related: Affected; affecting.

affect af·fect (ə-fěkt’)
v. af·fect·ed, af·fect·ing, af·fects

To have an influence on or affect a change in.

To attack or infect, as a disease.

n. (āf’ěkt’)

A feeling or emotion as distinguished from thought, or action.

A strong feeling with active consequences.