Etymology
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duplicate (adj.)

early 15c., "having two parts, double," from Latin duplicatus, past participle of duplicare "to double," from duo "two" (from PIE root *dwo- "two") + plicare "to fold" (from PIE root *plek- "to plait"). Meaning "exactly corresponding, that is an exact copy of" is from 1812.

duplicate (v.)

late 15c., "to repeat, produce a second (like the first);" 1620s, "to double," from Latin duplicatus, past participle of duplicare "to double," from duo "two" (from PIE root *dwo- "two") + plicare "to fold" (from PIE root *plek- "to plait"). Related: Duplicated; duplicating.

duplicate (n.)

1530s, "one of two or more things corresponding in every respect to each other," from duplicate (adj.). From 1701 as "another corresponding to a first or original, an exact counterpart or double of an original."

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Definitions of duplicate
1
duplicate (v.)
make or do or perform again;
duplicate (v.)
duplicate or match;
Synonyms: twin / parallel
duplicate (v.)
make a duplicate or duplicates of;
Could you please duplicate this letter for me?
duplicate (v.)
increase twofold;
Synonyms: double
2
duplicate (n.)
something additional of the same kind;
Synonyms: extra
duplicate (n.)
a copy that corresponds to an original exactly;
he made a duplicate for the files
Synonyms: duplication
3
duplicate (adj.)
being two identical;
Synonyms: matching / twin / twinned
duplicate (adj.)
identically copied from an original;
a duplicate key
From wordnet.princeton.edu