(genetics) Of corresponding segments of a chromosome in different individuals, identical because they were inherited from a common ancestor without crossover.

(of twins) being the result of two sperm cells fertilizing a single egg, which then splits into two embryos. They share all of the mother's genetic material but only half of the father's.

(genetics) Two identical alleles or two identical segments or sequences of DNA; segments which are not identical by descent and therefore do not share a recent common ancestor

Synonym of semi-identical

plural of non-identical

(algebra) An element of an algebraic structure, generally denoted 1, which is an identity for a multiplicative operation (generally denoted × or *, or by concatenation).

(algebra) An element of an algebraic structure, generally denoted 0, which is an identity for an additive operation (generally denoted +). That is, x + 0 = 0 + x = x for any x in the structure.

(algebra) An element of a structure that produces an identity mapping when applied on the right.

(algebra) An element of a structure that produces an identity mapping when applied on the left.

(algebra) An element of an algebraic structure which when applied, in either order, to any other element via a binary operation yields the other element.