Source : Webster's Revised Unabridged Dictionary (1913)

Twofold \Two"fold`\, a. [Cf. {Twifold}.]
   Double; duplicate; multiplied by two; as, a twofold nature; a
   twofold sense; a twofold argument.

Twofold \Two"fold`\, adv.
   In a double degree; doubly.

Source : WordNet®

twofold
     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}, {treble}, {threefold}]
     2: twice as great or many; "ate a double portion"; "the dose is
        doubled"; "a twofold increase" [syn: {double}, {doubled}]
     adv : by a factor of two; "the price increased twofold last year"
           [syn: {two times}]