Definition of later adverb from the Oxford Advanced American Dictionary

      

    later

     adverb
    adverb
    NAmE//ˈleɪt̮ər//
     
     
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  1. 1 at a time in the future; after the time you are talking about See you later. I met her again three years later. His father died later that year. We're planning a road trip for later in the year. She later became a doctor.
  2. 2Later! (informal) a way of saying goodbye, used by young people Later, guys!
  3. Idioms
    later on(informal)
     
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    at a time in the future; after the time you are talking about I'm going out later on. Much later on, she realized what he had meant.
    not/no later than…
     
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    by a particular time and not after it Please arrive no later than 8 o'clock.
See the Oxford Advanced Learner's Dictionary entry: later