Duplicate

[noun, adjective doo-pli-kit, dyoo-; verb doo-pli-keyt, dyoo-] /noun, adjective ˈdu plɪ kɪt, ˈdyu-; verb ˈdu plɪˌkeɪt, ˈdyu-/

noun
1.
a copy exactly like an original.
2.
anything corresponding in all respects to something else.
3.
Cards. a duplicate game.
verb (used with object), duplicated, duplicating.
4.
to make an exact copy of.
5.
to do or perform again; repeat:
He duplicated his father’s way of standing with his hands in his pockets.
6.
to double; make twofold.
verb (used without object), duplicated, duplicating.
7.
to become duplicate.
adjective
8.
exactly like or corresponding to something else:
duplicate copies of a letter.
9.
consisting of or existing in two identical or corresponding parts; double.
10.
Cards. noting a game in which each team plays a series of identical hands, the winner being the team making the best total score.
Idioms
11.
in duplicate, in two copies, especially two identical copies:
Please type the letter in duplicate.
adjective (ˈdjuːplɪkɪt)
1.
copied exactly from an original
2.
identical
3.
existing as a pair or in pairs; twofold
noun (ˈdjuːplɪkɪt)
4.
an exact copy; double
5.
something additional or supplementary of the same kind
6.
two exact copies (esp in the phrase in duplicate)
verb (ˈdjuːplɪˌkeɪt)
7.
(transitive) to make a replica of
8.
(transitive) to do or make again
9.
(transitive) to make in a pair; make double
10.
(intransitive) (biology) to reproduce by dividing into two identical parts: the chromosomes duplicated in mitosis
adj.

mid-15c., “having two parts, double,” from Latin duplicatus, past participle of duplicare “to double,” from duo “two” (see two) + plicare “to fold” see ply (v.1)). Meaning “exactly corresponding, that is an exact copy of” is from 1812.
v.

1620s, “to double,” from Latin duplicatus, past participle of duplicare (see duplicate (adj.)). Meaning “make an exact copy” is from 1640s (implied in duplicated). Related: Duplicating. The noun is first recorded 1530s.