Synonyms for Triplicate:

adj.

•triple (adjective)
triple, Trebled, three-ply, ternary, threefold.

n.

•three (noun)
ternary.
•trio (noun)
triple.

Other synonyms:

•Other relevant words:
ternary.

Usage examples for triplicate

1. All I have to say is, that since you have given me a triplicate birthday this time, any future anniversary will have to spread itself over four days if it wants to beat the record, that's all. – Tales of Fantasy and Fact by Brander Matthews

2. The ancients made much of such terms as duplicate, triplicate alternate, and inverse ratio, and also such as composition, separation, and conversion of ratio. – The Teaching of Geometry by David Eugene Smith