DICT.TW Dictionary Taiwan

 Dec·ade n.  A group or division of ten; esp., a period of ten years; a decennium; as, a decade of years or days; a decade of soldiers; the second decade of Livy. [Written also decad.]
    During this notable decade of years.   --Gladstone.
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 Dec·ad n. A decade.
    Averill was a decad and a half his elder.   --Tennyson.
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