effective

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Pronunciation[change]

Adjective[change]

Positive
effective

Comparative
more effective

Superlative
most effective

  1. An effective strategy, treatment, method, etc is one that works well as planned.
    Teachers are using instructional strategies that are most effective in helping students learn.
  2. If you have effective command, consent, control, etc., you have it in practice but not officially.
    The students had effective control over what the teacher would include on the test.
  3. If a law, agreement, change, etc. becomes effective, it officially begins.
    The new rules about ball size are effective next season.

Usage[change]

  • This word is commonly confused with affective, which is a rare technical word about emotions.

Related words[change]

Preposition[change]

Preposition
effective

  1. You use effective to say when something starts officially.
    Effective next week, all employees will wear the new uniform.