👉 In mathematics, an "ossature" is a type of object or element that is defined as having certain properties and has certain relationships with other objects. These properties can include being closed under a binary operation (such as addition), being a subgroup of a group, or being a normal subgroup of some other group. The term "ossature" is often used in the context of algebraic structures or groups to denote an element that satisfies certain mathematical properties and relationships with other elements within those structures.