WordWeb Online

1. Make certain in the future
   "This nest egg will ensure a nice retirement for us"
   - guarantee, insure, assure, secure
    
2. Be careful or certain to do something; make certain of something
   "ensure that the curtains are closed"
   - see, check, insure, see to it, control, ascertain, assure

Sounds like: insure

Derived forms: ensures, ensured, ensuring

Type of: verify

Encyclopedia: Ensure