Source : Webster's Revised Unabridged Dictionary (1913)

Sixfold \Six"fold`\, a. [AS. sixfealand.]
   Six times repeated; six times as much or as many.

Source : WordNet®

sixfold
     adj : having six units or components [syn: {sextuple}]
     adv : by a factor of six; "the population of this town increased
           sixfold when gold was found in the surrounding hills"
           [syn: {six times}]