WordWeb Online

1. Three times as great or many
   "a claim for threefold damages"; "a threefold increase"
   - treble, three-fold, triple
    
2. Having more than one decidedly dissimilar aspects or qualities
   "a threefold role for an actor"
   - double, dual, twofold, two-fold, treble, three-fold

1. By a factor of three
   "our rent increased threefold in the past five years"
   - three times

See also: multiple

Encyclopedia: Threefold