1 (often foll. by with) (of different things) agreeing in every detail.
2 (of one thing viewed at different times) one and the same.
3 (of twins) developed from a single fertilized ovum, therefore of the same sex and usu. very similar in appearance.
4 Logic & Math. expressing an identity.
Derivatives:
identically adv. identicalness n.
Etymology: med.L identicus (as IDENTITY)
Useful english dictionary. 2012.