valency

noun, plural va·len·cies. Chemistry.

1. valence.

noun plural -cies or -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 combinesthe English verb `give’ takes a subject and two objects, so it has a valency of three
3. immunol
   1. the number of antigen-binding sites on an antibody molecule
   2. the number of antigen-binding sites with which an antigen can combine