[1] : The Collaborative International Dictionary of English v.0.48

twice \twice\ twimacs, adv. oe. twies where the s is the
   adverbial ending; see -wards, twie, as. twiges, twiwa;
   akin to twi- in comp. two, g. zwie-, ohg. zwi-, icel.
   tvimac-, l. bi-, gr. di-, skr. dvi-, and e. two. see
   two.
   1913 webster
   1. two times; once and again.
      1913 webster

            he twice essayed to cast his son in gold. --dryden.
      1913 webster

   2. doubly; in twofold quantity or degree; as, twice the sum;
      he is twice as fortunate as his neighbor.
      1913 webster

   note: twice is used in the formation of compounds, mostly
         self-explaining; as, twice-born, twice-conquered,
         twice-planted, twice-told, and the like.
         1913 webster
see also:
-wards two 

[2] : WordNet (r) 2.0

twice
     adv 1: two times; "i called her twice"
     2: to double the degree; "she was doubly rewarded"; "his eyes
        were double bright" syn: doubly, double
see also:
doubly double 

[3] : THE DEVIL'S DICTIONARY ((C)1911 Released April 15 1993)

twice, adv.  once too often.

Twice >> T Words
Twice, definition of term: Twice
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