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effective

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adjective effective pronunciation in American English /ɪˈfektɪv/

Related meanings

  1. 1
    someone or something that is effective works well and produces the result that was intended

    Humor is often far more effective than shouting.

    You need more effective communication within the organization.

    The troops should be deployed where they will be most effective.

    effective against:

    The new vaccine is highly effective against all strains of the disease.

    effective way/method/means:

    This is a very effective way of controlling pests and weeds.

  2. 2
    formal when a law or agreement becomes effective, it officially begins to be used
    effective from:

    Government ministers reached a 30-month agreement, effective from July 1.

derived word

effectiveness

 effective pronunciation in American English noun [uncountable]

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