n. The practice of marrying only once, or the principle which upholds that practice; the principle that forbids remarriage after the death of a former husband or wife: opposed to digamy. See bigamy, 2.n. The condition of being married to only one person at one time: opposed to bigamy or polygamy. See bigamy, 1.n. In zoology, the habit of having only one mate; the habit of living in pairs; the paired state.