effective

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Pronunciation[change]

Adjective[change]

Positive
effective

Comparative
more effective

Superlative
most effective

  1. Something that can make or is making an effect.
  2. Something that is efficient.
    as an effective force, remedy, speech
  3. Something that is being used.
    The curfew is effective at midnight.

Preposition[change]

Preposition
effective

  1. Effective next week, all employees will wear the new uniform.