1. having a postage stamp already affixed or printed on it

Examples

• She bought prestamped envelopes at the post office.
• The prestamped postcards made mailing thank-you notes convenient.
• All business reply mail uses prestamped envelopes.
• The wedding invitations came with prestamped return envelopes.
• He preferred prestamped stationery for his correspondence.
• The survey included a prestamped envelope for responses.