postage stamp
noun/ˈpəʊstɪdʒ stæmp/
/ˈpəʊstɪdʒ stæmp/
(formal)- a stamp (= a small piece of paper with a design on it that you buy and stick on an envelope or a package before you post it)
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postage stamp
Definition of postage stamp noun from the Oxford Advanced Learner's Dictionary