effective.

1. Producing the result that is wanted.

2. Officially operating or applying from a particular time.

Use it for

Words that belong together

• effective intervention
• effective strategy

On the page

The intervention was effective only when participants attended regularly.

Usage notes

Primary category: academic / formal. Forms: Comparative more effective; superlative most effective when comparison is meaningful. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Commonness: moderately common.