linkage

noun

a linking or being linked
a series or system of links, slides, cranks, wheels, or gears for transmitting power or motion
Biol. the tendency of some genes to remain together and act as a unit () in inheritance, generally in the same chromosome
Chem.
1. bond (sense )
2. the type of bonding between various atoms or groups in a molecule
Elec. the product of the number of lines of magnetic flux times the number of turns in the coil surrounding it: it is used to measure the voltage that is induced by magnetic flux

See linkage in American Heritage Dictionary 4