Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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ice age a long period of time when glaciers covered large parts of the earth.
middle age the period of human life between youth and old age, or the years between forty and sixty-five.
Stone Age the stage of human culture when stone tools and weapons were made and used. The Stone Age dates from about two million B.C. to about 3,500 B.C.