suppressionn.[L. suppressio: cf. F. suppression.]1. The act of suppressing, or the state of being suppressed; repression; as, the suppression of a riot, insurrection, or tumult; the suppression of truth, of reports, of evidence, and the like.()2. (Med.) Complete stoppage of a natural secretion or excretion; as, suppression of urine; -- used in contradiction to retention, which signifies that the secretion or excretion is retained without expulsion.(Quain.)3. (Gram.) Omission; as, the suppression of a word.()()