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effectual

adjective

Reveal meaning and examples

Successful in producing an intended result.

The new filing method proved an effectual remedy for the missing papers.
Dictionary practice example.
A fictional stationery shop tested the efficacy of a new collection shelf by observing whether customers could find prepaid orders more easily. Clear name labels proved effectual during the trial, allowing customers to identify their parcels without asking an assistant.
From Does the Change Actually Work?.
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