Protest  —n. 1 statement or act of dissent or disapproval. 2 law written declaration that a bill has been presented and payment or acceptance refused. —v. 1 (usu. Foll. By against, at, about, etc.) Make a protest. 2 affirm (one's innocence etc.) Solemnly. 3 law write or obtain a protest in regard to (a bill). 4 us object to (a decision etc.).  under protest unwillingly.  protester n. (also protestor). [latin protestor declare formally]