English-English Dictionary

Meaning of the word effective in English

What does effective mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

effective

US /əˈfek.tɪv/
UK /ɪˈfek.tɪv/
"effective" picture

Adjective

1.

successful in producing a desired or intended result

Example:
•
The new policy proved to be very effective in reducing crime.
•
This medicine is highly effective against the flu.
Synonym:
efficacious successful productive potent powerful
Antonym:
ineffective useless
2.

(of a law or agreement) coming into operation or effect

Example:
•
The new regulations will be effective from January 1st.
•
The contract is effective immediately.
Synonym:
operative valid binding in force
Antonym:
ineffective invalid
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Related Word:
effect effectively effectiveness in effect to no effect to that effect greenhouse effect