ˈdʌb.əl ˈdjuː.əl ˈd(j)uː.əl by a factor of two the price increased twofold last year twice as great or many ate a double portion the dose is doubled a twofold 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 every episode has its double and treble meaning