du·pli·cate 
(dplĭ-kĭt, dy-)
(dplĭ-kĭt, dy-)adj.
1. Identically copied from an original.
2. Existing or growing in two corresponding parts; double.
3. Denoting a manner of play in cards in which partnerships or teams play the same deals and compare scores at the end: duplicate bridge.
n.
1. An identical copy; a facsimile.
2. One that corresponds exactly to another, especially an original.
3. Games A card game in which partnerships or teams play the same deals and compare scores at the end.
v. (-kāt′) du·pli·cat·ed, du·pli·cat·ing, du·pli·cates
v.tr.
1. To make an exact copy of.
2. To make twofold; double.
3. To make or perform again; repeat: a hard feat to duplicate.
v.intr.
To become duplicate.
[Middle English, from Latin duplicātus, past participle of duplicāre, to double, from duplex, duplic-, twofold; see dwo- in the Appendix of Indo-European roots.]
dupli·ca·ble, dupli·cat′a·ble (-kā′tə-bəl) adj.
dupli·cate·ly adv.
dupli·ca′tive adj.
dupli·ca·to′ry (-kĭ-tôr′ē) adj.