acceptor UK /əkˈsɛptə(ɹ)/US /əkˈsɛp.tɚ/ noun7 •One who accepts. •An atom or molecule which can accept an electron to form a chemical bond. •A transfer RNA molecule that can accept a specific amino acid •A chemical acceptor atom forming a positive hole in a semiconductor •One who accepts a draft or a bill of exchange; a drawee after he has accepted. •A kind of finite-state machine whose binary output indicates whether or not a received input was accepted. •A cluster of skin cells that respond to pain formsacceptors