• Adjective

    consisting of four.
    arranged in fours.
    ( initial capital letter ) Geology . noting or pertaining to the present period of earth history, forming the latter part of the Cenozoic Era, originating about 2 million years ago and including the Recent and Pleistocene Epochs.
    Metallurgy . (of an alloy) having four principal constituents.

    Noun

    a group of four.
    the number four.
    ( initial capital letter ) Geology . the Quaternary Period or System.
    Lấy từ « http://tratu.soha.vn/dict/en_en/Quaternary »

    tác giả


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