'Valency' definitions:
Definition of 'valency'
From: WordNet
noun
The phenomenon of forming chemical bonds
noun
(biology) a relative capacity to unite or react or interact as with antigens or a biological substrate [syn: valence, valency]
noun
(chemistry) a property of atoms or radicals; their combining power given in terms of the number of hydrogen atoms (or the equivalent) [syn: valence, valency]
Definition of 'Valency'
From: GCIDE