Definitions for valencyˈveɪ lən si
Random House Webster's College Dictionary
va•len•cyˈveɪ lən si(n.)(pl.)-cies.
Ref: valence. 1
the phenomenon of forming chemical bonds
(biology) a relative capacity to unite or react or interact as with antigens or a biological substrate
(chemistry) a property of atoms or radicals; their combining power given in terms of the number of hydrogen atoms (or the equivalent)
The number of edges connected to a vertex in a graph
The capacity of a verb to take a specific number of arguments
a unit of combining power; a so-called bond of affinity
The Standard Electrical Dictionary
The relative power of replacing hydrogen or combining therewith possessed by different elements; the number of atomic bonds belonging to any element. Thus oxygen has a twofold valency, is bivalent or is a dyad, and combines with two atoms of hydrogen because the latter has a unitary atomicity, is monovalent or is a monad.