the fact of being who or what a person or thing is
he knows the identity of the bombers
she believes she is the victim of mistaken identity
a close similarity or affinity
an identity between the company's own interests and those of the local community
a transformation that leaves an object unchanged
the equality of two expressions for all values of the quantities expressed by letters, or an equation expressing this, e.g. (x + 1)² = x ² + 2x + 1