adj. 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. identically adv. identicalness n.
[ med.L identicus (as IDENTITY) ]