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    Online English Dictionary

    Wordnet English Dictionary

    noun
    any specific behavior; "they avoided all recreational activity"
    the state of being active; "his sphere of activity"; "he is out of action"
    an organic process that takes place in the body; "respiratory activity"
    (chemistry) the capacity of a substance to take part in a chemical reaction; "catalytic activity"
    a process existing in or produced by nature (rather than by the intent of human beings); "the action of natural forces"; "volcanic activity"
    the trait of being active; moving or acting rapidly and energetically; "the level of activity declines with age"

    Wordnet English Thesaurus

    noun
    pursuit, occupation, action, venture, undertaking, enterprise, project, scheme, spryness, hobby, bustle, hustle, hustle and bustle, liveliness, activeness

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