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Definition of affect

affect

/əˈfɛkt/
af · fect

Adverb:affectively
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Plural:affects
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Adjective:affective
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Past Simple:affected
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Past Participle:affected
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Present Participle:affecting
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affect Lexical Profile

affect Game Scores & Validity

• verb

1

To have an influence on or produce a change in someone or something.

Example

"Rising ocean temperatures directly affect marine ecosystems around the globe."


2

To touch the feelings of someone or move them emotionally.

Example

"We were deeply affected by the heartfelt stories shared during the memorial service."


3

To infect, attack, or cause physical harm to a part of the body or a living organism (especially of a disease or condition).

Example

"The damp weather tends to affect her joints and make mobility difficult."


4

To pretend to have or feel something, or to deliberately adopt a particular manner or style for artificial effect.

Example

"Despite knowing the truth, he affected an air of complete surprise when the announcement was made."

Synonyms
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Antonyms
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• noun

1

An observable expression or subjective experience of emotion or mood, especially as evaluated in psychology and psychiatry.

Example

"The clinician noted that the patient spoke with a flat affect throughout the interview."

Synonyms
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Word Nuance & Usage

Frequently confused with 'effect': in everyday usage, 'affect' is primarily a verb meaning to influence, whereas 'effect' is primarily a noun meaning a result. As a noun, 'affect' (pronounced with stress on the first syllable) is restricted to technical contexts in psychology.

• Rhymes for affect

Word Origin & Etymology

Borrowed in the late 14th century from Old French and directly from Latin afficere ('to act upon, influence, or dispose'), formed from the assimilated prefix ad- ('to') and facere ('to make, do').

Cite this Entry


Wordmom. (2026). Definition of Affect. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/affect
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