duplicate

adj. 1 identical. 2 a having two identical parts. B doubled. 3 (of card-games) with the same hands played by different players. n. 1 identical thing, esp. A copy. 2 copy of a letter etc. v. (-ting) 1 multiply by two; double. 2 make or be an exact copy of. 3 repeat (an action etc.), esp. Unnecessarily.  in duplicate in two exact copies.  duplication n. [latin: related to *duplex]

a. Double; twofold.