Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.
Class I. Words Expressing Abstract RelationsSection V. Number
2. Determinate Number
93. Triplication.
NOUN:TRIPLICATION, triplicity; trebleness, terza, trine; trilogy.VERB:TREBLE, triple, triplicate, cube.
ADJECTIVE:TREBLE, triple; tern, ternary, ternate, tertiary; triplicate, threefold, trilogistic; triplasic; third; trinal, trine [rare].
ADVERB:THREE TIMES, thrice, in the third place, thirdly, threefold, triply, trebly &c. adj.