a device for making marks on documents; a mark made in this way nouna device for making marks on documents; a mark made in this way ExamplesThe invoice has the stamp 'Received with thanks' on it. • The customs officer looked at the stamps in her passport.verbto mark a document with a stamp Examplesto stamp an invoice 'Paid' • The documents were stamped by the customs officials.to put a postage stamp on an envelope or parcel to mark a document with a stamp to put a postage stamp on an envelope or parcel