valency

Collins
World English Dictionary
valency or esp (US and Canadian) valence (ˈveɪlənsɪ)
 
n , pl -cies, -ces
1.  chem a property of atoms or groups, equal to the number of atoms of hydrogen that the atom or group could combine with or displace in forming compounds
2.  linguistics the number of satellite noun phrases with which a verb combines: the English verb `give' takes a subject and two objects, so it has a valency of three
3.  immunol
 a.  the number of antigen-binding sites on an antibody molecule
 b.  the number of antigen-binding sites with which an antigen can combine
 
[C19: from Latin valentia strength, from valēre to be strong]
 
valence or esp (US and Canadian) valence
 
n
 
[C19: from Latin valentia strength, from valēre to be strong]

Collins English Dictionary - Complete & Unabridged 10th Edition
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