closing form noun5 •(US) A form in an authority filled to formally document the closing a case. •(US) A form used to document an important legal transaction.They boast over 1700 merge variables for use in word processing in order to fully customize all necessary closing forms including deeds, affidavits, payoff letters etc. — 2003 •A standard formula to end a letter. •A standard formula to end a speech. •A method to end an implemented functionality. formsclosing forms