Noun
(mathematics) The coclass of a finite p-group of order p is n - c, where c is the class.
(programming) A class that implements a COM (Common Object Model) interface.
Source: en.wiktionary.orgThey admit a classification of finite p-groups in directed coclass graphs consisting of only finitely many coclass trees whose (infinitely many) members are characterized by finitely many parametrized presentations. Source: Internet