Main entry: double, doubled, two-fold, twofold
Definition: twice as great or many
Usage: ate a double portion; the dose is doubled; a twofold increase
Main entry: dual, double, treble, two-fold, twofold, three-fold, threefold
Definition: having more than one decidedly dissimilar aspects or qualities
Usage: 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