'Tripling' definitions:

Definition of 'tripling'

(from WordNet)
noun
Increase by a factor of three

Definition of 'Tripling'

From: GCIDE
  • 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. [1913 Webster]