n. The fact of being coincident, or of occupying the same place in space or the same position in a scale or series; exact correspondence in position: as, the coincidence of equal triangles.n. A happening at the same time or existence during the same period; contemporaneousness.n. Hence Concurrence; agreement in circumstance, character, etc.; more or less exact correspondence generally, or an instance of exact correspondence; especially, accidental or incidental concurrence; accidental agreement: as, the coincidence of two or more opinions.