I. -zə(r) noun
( -s )
: one that normalizes ; specifically : one that heat-treats metal to relieve internal strains and strengthen it during or after the annealing process
II. noun
1. : a subgroup consisting of those elements of a group for which the group operation with regard to a given element is commutative
2. : the set of elements of a group for which the group operation with regard to every element of a given subgroup is commutative