Linkage \Link"age\ (l[i^][ng]k"[asl]j; 48), n.

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

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

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

Source: Webster's Revised Unabridged Dictionary (1913)