Definition of contingent noun from the Oxford Advanced Learner's Dictionary. a group of people at a meeting or an event who have something in common, especially the place they come from, that is not shared by other people at the event. The largest contingent was from the United States. When an event or situation is contingent, it means that it depends on some other event or fact. For example, sometimes buying a new house has to be contingent upon someone else buying your old house first. That way you don't end up owning two houses! CONTINGENT definition: 1. a group of people representing an organization or country, or a part of a military force: 2…. Learn more. contingent (plural contingents) An event which may or may not happen; that which is unforeseen, undetermined, or dependent on something in the future. synonyms