Linkage

Part of speech: noun (n.)

1. The act of linking; the state of being linked; also, a system of links.

2. Manner of linking or of being linked; -- said of the union of atoms or radicals in the molecule.

3. A system of straight lines or bars, fastened together by joins, and having certain of their points fixed in a plane. It is used to describe straight lines and curves in the plane.