Etymology
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linkage (n.)

"system of combined links," 1874, originally in mechanical engineering, from link (v.) + -age.

To understand the principle of Peaucellier's link-work, it is convenient to consider previously certain properties of a linkage, (to coin a new and useful word of general application), consisting of an arrangement of six links, obtained in the following manner ... (etc.). ["Recent Discoveries in Mechanical Conservation of Motion," in "Van Nostrand's Eclectic Engineering Magazine," vol. xi, July-December 1874]

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Definitions of linkage

linkage (n.)
an associative relation;
linkage (n.)
(genetics) traits that tend to be inherited together as a consequence of an association between their genes; all of the genes of a given chromosome are linked (where one goes they all go);
Synonyms: gene linkage
linkage (n.)
a mechanical system of rods or springs or pivots that transmits power or motion;
linkage (n.)
the act of linking things together;
From wordnet.princeton.edu