n. A unit; specifically, a single pip on a card or die, or a card or die marked with a single pip.n. A very small quantity; a particle; an atom; a trifle: as, the creditor will not abate an ace of his demand.n. A noun-suffix occurring in populace, pinnace, etc. (which see). It is not used as an English formative. In menace, grimace, and other words, the suffix is of different origin.