WordReference Random House Unabridged Dictionary of American English © 2026
in•du•pli•cate
(in do̅o̅′plə kit, -kāt′, -dyo̅o̅′-),USA pronunciation adj. [Bot.]
in•du′pli•ca′tion, n.
WordReference Random House Learner's Dictionary of American English © 2026- Botanyfolded or rolled inward: said of the parts of the calyx or corolla when the edges are bent abruptly toward the axis, or of leaves in vernation when the edges are rolled inward and then arranged about the axis without overlapping.
- in-2 + duplicate 1820–30
du•pli•cate /n., adj. ˈduplɪkɪt, ˈdyu-; v. -ˌkeɪt/USA pronunciation
n., v., -cat•ed, -cat•ing, adj.
n. [countable]
v. [~ + object]
adj. [before a noun]
du•pli•ca•tion /ˌduplɪˈkeɪʃən, ˌdyu-/USA pronunciation n. [uncountable]illegal duplication of material.See -du-, -plic-.
WordReference Random House Unabridged Dictionary of American English © 2026n. [countable]
- an exact copy:He made a duplicate and handed me the original.
v. [~ + object]
- to make an exact copy of:She duplicated a few copies of my letter and handed me the original.
- to do or perform again;
repeat:You'll just have to duplicate your performance.
adj. [before a noun]
- exactly like or corresponding to something else:a duplicate key.
- Idioms in duplicate, in two identical copies:I'll need your letter, in duplicate, on my desk by morning.
du•pli•ca•tion /ˌduplɪˈkeɪʃən, ˌdyu-/USA pronunciation n. [uncountable]illegal duplication of material.See -du-, -plic-.
du•pli•cate
(n., adj. do̅o̅′pli kit, dyo̅o̅′-;v. do̅o̅′pli kāt′, dyo̅o̅′-),USA pronunciation n., v., -cat•ed, -cat•ing, adj.
n.
v.t.
v.i.
adj.
du′pli•ca′tive, adj.
n.
- a copy exactly like an original.
- anything corresponding in all respects to something else.
- Games[Cards.]a duplicate game.
- Idioms in duplicate, in two copies, esp. two identical copies:Please type the letter in duplicate.
v.t.
- to make an exact copy of.
- to do or perform again;
repeat:He duplicated his father's way of standing with his hands in his pockets. - to double;
make twofold.
v.i.
- to become duplicate.
adj.
- exactly like or corresponding to something else:duplicate copies of a letter.
- consisting of or existing in two identical or corresponding parts;
double. - Games[Cards.]noting a game in which each team plays a series of identical hands, the winner being the team making the best total score.
- Latin duplicātus (past participle of duplicāre to make double), equivalent. to duplic- (stem of duplex) duplex + -ātus -ate1
- late Middle English 1400–50
- 1. facsimile, replica, reproduction. 5. See imitate. 10. twofold.
- 1. original.