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    evolutionary

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    evolutionary
    ev‧o‧lu‧tion‧a‧ry AC /ˌiːvəˈluːʃənəri◂, ˌevə- $ ˌevəˈluːʃəneri◂/ adjective
     Word Family: verb: evolve; noun: evolution; adjective: evolutionary
    1. relating to the way in which plants and animals develop and change gradually over a long period of time:
        the evolutionary development of birds
        Some scientists have rejected evolutionary theory.
    2. relating to the way in which ideas or situations gradually change and develop over a long period of time:
        He is in favour of gradual, evolutionary social change.