From WordNet (r) 3.0 (2006):
twofold
adv 1: by a factor of two; "the price increased twofold last
year" [syn: twofold, two times]
adj 1: having more than one decidedly dissimilar aspects or
qualities; "a double (or dual) role for an actor"; "the
office of a clergyman is twofold; public preaching and
private influence"- R.W.Emerson; "every episode has its
double and treble meaning"-Frederick Harrison [syn:
double, dual, twofold, two-fold, treble,
threefold, three-fold]
2: twice as great or many; "ate a double portion"; "the dose is
doubled"; "a twofold increase" [syn: double, doubled,
twofold, two-fold]