Webster's English Dictionary

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assure

Cross references:
  1. ensure                
 
as.sure \*-'shu.(*)r\ vt [ME assuren, fr. MF assurer, fr. ML assecurare, 
   fr. L ad-)X + securus secure 1: to make safe (as from risks or against 
   overthrow) : INSURE  2: to give confidence to : REASSURE to make sure or 
   certain : MCONVINCE 4: to inform positively  5: to make certain the coming 
   or attainment of : GUARANTEE