1. [adv]  seven times; "the population of this village increased sevenfold in the past 100 years"
2. [adj]  having seven units or components

SEVENFOLD is a 9 letter word that starts with S.

1. \Sev"en*fold`\, a.
   Repeated seven times; having seven thicknesses; increased to
   seven times the size or amount. ``Sevenfold rage.'' --Milton.
   
   

2. \Sev"en*fold`\, adv.
   Seven times as much or as often.
   
         Whosoever slayeth Cain, vengeance shall be taken on him
         sevenfold.                               --Gen. iv. 15.