Co-in'ci-dence, n.
n. [Fr. coïncidence.]
Sense 1. The act or condition of falling together; agreement in position; as, the coincidence of circles, surfaces, bodies, &c. Bentley.
Sense 2. The act or state of agreeing or corresponding; agreement; especially the concurrence of events at the same time. “A coincidence suited to render internal agitations terribly unwelcome.” Palfrey.
The want of exact coincidence between these two notes is an inherent arithmetical imperfection in the musical scale. Whewell.