Webster's English Dictionary

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ensure

en.sure \in-'shu.(*)r\ vt [ME ensuren, fr. AF enseurer, prob. alter. of OF 
   aseu:er] : to make sure, certain, or safe : GUARANTEE an outcome sure. 
   ENSURE implies a making certain and inevitable; INSURE stresses the taking 
   of necessary measures beforehand to make a result certain or provide for 
   any probable contingency; ASSURE implies a making sure in mind by removing 
   all doubt and suspense; SECURE implies action taken to guard against attack 
   or loss SYN syn ENSURE, INSURE, ASSURE, SECURE mean to make