4. (adj)ternary, treble, triple, triplex having three units or components or elements "a ternary operation"; "a treble row of red beads"; "overcrowding made triple sessions necessary"; "triple time has three beats per measure"; "triplex windows"
5. (adj)treble, threefold, three-fold, triple threetimes as great or many
"a claim for treble (or triple) damages"; "a threefold increase"
6. (verb)triple, treble increase threefold
"Triple your income!"