\Trip"li*cate\, a. [L. triplicatus, p. p. of
triplicare to triple, treble; tri- (see {Tri-}) + plicare to
fold. See {Ply}, v. t.]
Made thrice as much; threefold; tripled.
{Triplicate ratio} (Math.), the ratio of the cubes of two
   quantities; thus, the triplicate ratio of a to b is a^{3}:
   b^{3}.

\Trip"li*cate\, n.
A third thing corresponding to two others of the same kind.