Synonyms for Twofold (same or very similar meaning)
WordNet sense 1 (having more than one decidedly dissimilar aspects or qualities):
double, dual, threefold, treble, two-fold, three-fold
WordNet sense 2 (twice as great or many):
doubled
WordNet sense 3 (having or involving or consisting of more than one part or entity or individual):
multiple
WordNet sense 4 (by a factor of two):
two times
From the ODE community, based on WordNet
add/edit