WordNet sense 1 (the pitch range of the highest female voice):

soprano

WordNet sense 2 (three times as great or many):

threefold, triple, three-fold

WordNet sense 3 (having three units or components or elements):

ternary, triplex

WordNet sense 4 (having more than one decidedly dissimilar aspects or qualities):

double, dual, twofold, two-fold

WordNet sense 5 (having or involving or consisting of more than one part or entity or individual):

multiple

WordNet sense 6 (used of sounds and voices; high in pitch or frequency):

high, high-pitched