Definition of now adverb from the Oxford Advanced American Dictionary

      

    now

     adverb
    adverb
    NAmE//naʊ//
     
     
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  1. 1(at) the present time Where are you living now? It's been two weeks now since she called. It's too late now. From now onI'll be more careful. He'll be home by now. I've lived at home up till now. That's all for now.
  2. 2at or from this moment, but not before Start writing now. I am now ready to answer your questions.
  3. 3(informal) used to show that you are annoyed about something Now they want to tax food! What do you want now? It's broken. Now I'll have to get a new one.
  4. 4used to get someone's attention before changing the subject or asking them to do something Now, listen to what she's saying. Now, the next point is quite complex. Now come and sit down. Now let me think…
  5. Idioms
    (every) now and again/then
     
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    from time to time; occasionally Every now and again she checked to see if he was still asleep.
    now for somebody/something
     
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    used when turning to a fresh activity or subject And now for some travel news.
    now, now(also now then)
     
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    used to show in a mild way that you do not approve of something Now then, that's enough noise.
    now… now…
     
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    at one time… at another time… Her moods kept changing—now happy, now sad.
    (it's) now or never
     
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    this is the only opportunity someone will have to do something
    1. 1= now, now
    2. 2used when making a suggestion or an offer Now then, who wants to come for a walk?
      now what?(informal)
       
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    1. 1(also what is it now?) used when you are annoyed because someone is always asking questions or interrupting you “Yes, but Dad…” “Now what?”
    2. 2used to say that you do not know what to do next in a particular situation
See the Oxford Advanced Learner's Dictionary entry: now