triplicity(n = noun.group) trigon - (astrology) one of four groups of the zodiac where each group consists of three signs separated from each other by 120 degrees;
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triplication, triplicity, trebleness, trine, treble, triple, tern, ternary, triplicate, threefold, trilogistic, third, trinal, trine, three times, three fold, thrice, in the third place, thirdly, trebly.