coincides

Coincide is a verb with several related senses. It most often means to occur at the same time or to be in the same place. For example, two events coincide when their times match; a meeting may coincide with a holiday, affecting attendance. In geometry and related fields, coincide also describes objects that lie exactly on top of each other, such as coinciding lines or points.

Etymology and forms: Coincide comes from Latin co- (together) and incidere (to fall upon, to happen). The word has a family of related forms, including coincident (adjective), coincidence (noun), and coincidentally (adverb). The noun coincidence refers to a surprising or notable occurrence where events happen at the same time or in a related way by chance.

Usage: In everyday language, coincide is often followed by with or that: “The schedules coincide” or “These dates coincide.” Coincidentally is used to describe something that happens by chance in a way that seems notable but is not causal. In mathematics and logic, coinciding implies identity of position or mapping, such as coincident lines in a plane or coincident points on a curve. The term emphasizes exact alignment rather than approximate overlap.

See also: coincidence, coincident. The concepts span linguistics, everyday usage, and geometry, illustrating how a single verb covers timing, location, and identity of position across disciplines.