Definition of instant noun from the Oxford Advanced American Dictionary

     

    instant

     noun
    noun
    NAmE//ˈɪnstənt//
     
    [usually singular]
     
    jump to other results
  1. 1a very short period of time synonym moment I'll be back in an instant. Just for an instant I thought he was going to refuse.
  2. 2a particular point in time At that (very) instant, the door opened. I recognized her the instant (that) (= as soon as) I saw her. Come here this instant! (= immediately)
See the Oxford Advanced Learner's Dictionary entry: instant