threefold

three times as great or many; "a claim for treble (or triple) damages"; "a threefold increase"

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

by a factor of three; "our rent increased threefold in the past five years"