Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

93. Triplication — N. triplication, triplicity†; trebleness†, trine.

V. treble, triple; triplicate, cube. Adj. treble, triple; tern, ternary; triplicate, threefold, trilogistic†; third; trinal†, trine. Adv. three times, three fold; thrice, in the third place, thirdly; trebly &c adj..