identical

adjective

• 1similar in every detail; exactly alike:four girls in identical green outfits the passage on the second floor was identical to the one below
• (of twins) developed from a single fertilized ovum, and therefore of the same sex and usually very similar in appearance. Compare with fraternal (sense 2).
• [attributive] (of something encountered on separate occasions) the same:she stole a suitcase from the identical station at which she had been arrested before

• 2 Logic & Mathematics expressing an identity:an identical proposition