quintupling

from WordNet (r) 3.0 (2006)

quintupling
    n 1: increasing by a factor of five

from The Collaborative International Dictionary of English v.0.48

Quintuple \Quin"tu*ple\, v. t. [imp. & p. p. {Quintupled}; p.
   pr. & vb. n. {Quintupling}.] [Cf. F. quintupler.]
   To make fivefold, or five times as much or many.
   [1913 Webster]