forgery UK /ˈfɔː.dʒəɹ.ɪ/US /ˈfɔːɹ.d͡ʒəɹ.ɪ/ noun4 •The act of forging, fabricating, or producing falsely; especially the crime of fraudulently making or altering a writing or signature purporting to be made by another, the false making or material alteration of or addition to a written instrument for the purpose of deceit and fraud. •That which is forged, fabricated, falsely devised or counterfeited. •The act of forging metal into shape.the forgery of horseshoes •(no longer used) An invention, creation. formsforgeries