/ pɒˈstɪəriə(r); NAmE pɑːˈstɪr-/ adjective , noun
■ adjective
[ only before noun ] ( technical ) located behind sth or at the back of sth
OPP anterior
■ noun
( humorous ) the part of your body that you sit on; your bottom
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WORD ORIGIN
early 16th cent. (as a plural noun denoting descendants): from Latin , comparative of posterus following, from post after.