Etymology
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triplicate (adj.)

early 15c., "triple, threefold," from Latin triplicatus, past participle of triplicare "to triple," from tri- "three" (see tri-) + plicare "to fold" (from PIE root *plek- "to plait").

triplicate (v.)

"to multiply by three," 1620s, from Latin triplicatus (see triplicate (adj.)). Related: Triplicated; triplicating; triplication.

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Definitions of triplicate
1
triplicate (v.)
reproduce threefold;
triplicate the letter for the committee
2
triplicate (n.)
one of three copies; any of three things that correspond to one another exactly;
From wordnet.princeton.edu