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Definition of triplicate : 1. A third thing corresponding to two others of the same kind.
2. Made thrice as much; threefold; tripled.

Synonyms:

threefold, three-ply, trebled, triple, triplex, ternary

Usage examples:

• The mirror in the hat store is triplicate, so that you see yourself not only head- on but from each side. - "Love Conquers All", Robert C. Benchley.
• Another playground peculiarity was that after the hoop season, usually driven in duplicate or triplicate, the hoops were " stored" or " shied" into the branching elms, from which they were again brought down by hockey- sticks flung at them; a great boon to the smaller boys who thus gratuitously became possessed of valuable properties. - "My Life as an Author", Martin Farquhar Tupper.
• For instance, all the important installations exist in duplicate, some even in triplicate, as a precaution against Alliance space attack. - "Graveyard of Dreams", Henry Beam Piper.