sure sure /ˈʃʊr/

adjective

1. () Having or feeling no doubt or uncertainty; confident and assured  ( certain , sure )
   having or feeling no doubt or uncertainty; confident and assured
    Felt certain of success
   felt certain of success
    Was sure (or certain) she had seen it
   was sure (or certain) she had seen it
    Was very sure in his beliefs
   was very sure in his beliefs
    Sure of her friends
   sure of her friends
   
2. () Exercising or taking care great enough to bring assurance  ( certain , sure )
   exercising or taking care great enough to bring assurance
    Be certain to disconnect the iron when you are through
   be certain to disconnect the iron when you are through
    Be sure to lock the doors
   be sure to lock the doors
   
3. () Certain to occur; destined or inevitable  ( certain , sure )
   certain to occur; destined or inevitable
    He was certain to fail
   he was certain to fail
    His fate is certain
   his fate is certain
    In this life nothing is certain but death and taxes
   In this life nothing is certain but death and taxes
    He faced certain death
   he faced certain death
    Sudden but sure regret
   sudden but sure regret
    He is sure to win
   he is sure to win
   
4. () Reliable in operation or effect  ( certain , sure )
   reliable in operation or effect
    A quick and certain remedy
   a quick and certain remedy
    A sure way to distinguish the two
   a sure way to distinguish the two
    Wood dust is a sure sign of termites
   wood dust is a sure sign of termites
   
5. () Physically secure or dependable  ( sure )
   physically secure or dependable
    A sure footing
   a sure footing
    Was on sure ground
   was on sure ground
   
6. Impossible to doubt or dispute  ( indisputable , sure )
   impossible to doubt or dispute
    Indisputable (or sure) proof
   indisputable (or sure) proof
   
7. Certain not to fail  ( sure )
   certain not to fail
    A sure hand on the throttle
   a sure hand on the throttle
   
8. Infallible or unfailing  ( sure )
   infallible or unfailing
    A sure (or true) sign of one's commitment
   a sure (or true) sign of one's commitment
   
9. (of persons) worthy of trust or confidence  ( sure , trusted )
   (of persons) worthy of trust or confidence
    A sure (or trusted) friend
   a sure (or trusted) friend
   

adverb

1. () Definitely or positively (sure' is sometimes used informally for surely')  ( for certain , sure as shooting , for sure , certainly , sure , sure enough , surely )
   definitely or positively (sure' is sometimes used informally for surely')
    The results are surely encouraging
   the results are surely encouraging
    She certainly is a hard worker
   she certainly is a hard worker
    It's going to be a good day for sure
   it's going to be a good day for sure
    They are coming, for certain
   they are coming, for certain
    They thought he had been killed sure enough
   they thought he had been killed sure enough
    He'll win sure as shooting
   he'll win sure as shooting
    They sure smell good
   they sure smell good
    Sure he'll come
   sure he'll come
   

interjection

1. () [ N. American] A courteous reply to an expression of gratitude, acknowledging the appreciation.  ( sure [ N. American] , you bet [Informal] , don't mention it , my pleasure , no problem , not at all , you're welcome )
   A courteous reply to an expression of gratitude, acknowledging the appreciation.
   
2. () [Informal] Affirmative answers or indications of agreement.  ( ay [Dialect] , aye [Dialect] , ya [Informal, South Africa] , certainly , sure [Informal] , yea [Informal] , yeah [Informal] , yes , uh-huh [Informal] , yah [Informal, UK] , yep [Informal] , yup [Informal] )
   Affirmative answers or indications of agreement.