Hypertext Webster Gateway: "tripling"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Triple \Tri"ple\, v. i. [imp. & p. p. {Tripled}; p. pr. & vb. n.
{Tripling}.] [Cf. F. tripler. See {Triple}, a.]
To make threefold, or thrice as much or as many; to treble;
as, to triple the tax on coffee.
From WordNet (r) 1.7 (wn)
tripling
n : increase by a factor of three
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