(UK, law enforcement) A process by which a witness confirms the identity of a criminal suspect, by viewing the suspect together with other people who were not involved in the crime.

(psychology) A person's internal sense of self as belonging to a particular gender or genders, or to no gender.

plural of multiplicative identity

plural of Jacobi identity

(mathematics) Given a binary operation × defined on a set S which also has additive operation + and additive identity 0, the property that a × (b×c) + b × (c×a) + c × (a×b) = 0 for all a, b, c in S.

(mathematics) A theorem in the elementary theory of numbers: let a and b be integers, not both zero, and let d be their greatest common divisor. Then there exist integers x and y such that ax + by = d.

plural of right identity

(philosophy) The principle that, if two objects are indistinguishable from one another with respect to all of their properties, then they are identical.

(US, Canada, law) A government regulation establishing the criteria which must be met before a product may be labeled as being a certain food.

plural of standard of identity