Meaning & use
Effectivity
Last updated
The capacity to produce an intended result, or, in business and regulatory contexts, the date on which a rule, policy, or contract begins to apply.
See it in a sentence
The new tax rule has an effectivity date of January 1st.
Engineers measured the drug's effectivity across several dosage levels.
A note on using this word
Many style guides treat 'effectiveness' as the standard term and 'effectivity' as a less common variant, though it is widely used in engineering and legal documents, particularly outside North America.
Words with a similar meaning
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
ineffectiveness
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