1.  polyvalency(n = noun.state) multivalence, multivalency, polyvalence - (chemistry) the state of having a valence greater than two;
is a kind of state
Derived form adjective polyvalent₂

2.  polyvalency(n = noun.state) polyvalence - (toxicology) the state of being capable of counteracting more than one toxin or antigen or kind of microorganism;
is a kind of state
Derived form adjective polyvalent₁