1. 
[syn: tenfold, ten-fold, denary]
ADVERB (1)
1.  by ten times as much; 
- Example: "the population increased tenfold"
The Collaborative International Dictionary of English v.0.48:
Tenfold \Ten"fold`\, a. & adv.
   In tens; consisting of ten in one; ten times repeated.
   [1913 Webster]
         The grisly Terror . . . grew tenfold
         More dreadful and deform.                --Milton.
   [1913 Webster]
WordNet (r) 3.0 (2006):
tenfold
    adv 1: by ten times as much; "the population increased tenfold"
    adj 1: containing ten or ten parts [syn: tenfold, ten-fold,
           denary]