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affect
This word is frequently confused with effect. While effect is typically the result, affect is the process of producing that result. It carries a sense of active influence or modification, suggesting a causal link where one element alters the state of another. In psychological terms, the noun form describes the outward expression of emotion. This is a highly technical usage, distinct from the common verb, focusing on the observable manifestation of a mood rather than the internal feeling itself.
Countable when referring to a specific emotional expression in a clinical setting (a flat affect). Uncountable when referring to the general psychological experience of emotion.
Meanings
To produce a change in or influence something.
"The loud noise began to affect her concentration."
To pretend to feel or possess a certain quality.
"He affected a posh accent to impress the guests."
To touch the emotions of someone in a moving way.
"The tragic story deeply affected the audience."
A feeling or emotion, specifically in a psychological context.
"The patient exhibited a flat affect during the interview."