What does effect mean?
Effect is one of the most versatile and frequently used nouns in English, denoting the result or outcome that follows from an action, cause, or set of conditions. When we speak of the effect of a policy, a drug, or a remark, we are describing what that thing brings about in the world or in someone's perception. Beyond its core sense of 'result', effect can refer to a deliberate impression — as when lighting creates a dramatic effect — and in its plural form it can mean personal belongings, as in the phrase 'personal effects'. Less commonly, effect serves as a formal verb meaning to bring about, as in 'to effect change'. The word carries no strong connotation on its own; it is neutral, precise, and indispensable for describing causation. Its near-homophone affect causes frequent confusion, but remembering that effect is typically the noun and affect the verb resolves most cases.
A change or result produced by an action, cause, or agent.
"The drought had a devastating effect on crops."
Often used with 'have', 'an effect on'.
An impression produced in the mind; the overall look or sound created deliberately.
"The special effects in the film were stunning."
(In plural) Personal belongings.
"After his death, his personal effects were distributed among relatives."
(Formal) To bring about; to cause to happen.
"The committee voted to effect immediate reforms."
Often confused with 'affect'; used chiefly in formal contexts like 'effect change'.
The plural often refers to multiple results, or specifically to personal belongings in legal/formal contexts.
"Scientists studied the long-term effects of exposure to sunlight."
The phrase 'to effect change' uses 'effect' as a verb — one of the rare cases where this noun masquerades as an action.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of effect
Effect derives from Latin efficere ('to bring about, accomplish'), formed from ex- ('out') + facere ('to do, make'), entering Middle English via Old French around the late 14th century. It shares this root facere with a wide family including efficient, effective, and affect. The verbal use ('to bring about') developed from the same Latin sense of accomplishing something.
Related word forms
How effect is actually used
'Effect' is most commonly a noun; as a verb it is formal and means 'bring about' (e.g. effect change). In psychology, 'affect' is also a noun referring to emotional expression, which can add confusion.
Easily confused with effect
'Effect' is usually a noun meaning a result or change, while 'affect' is usually a verb meaning to influence something.