Definition of all pronoun from the Oxford Advanced American Dictionary

     

    all

     pronoun
    pronoun
    NAmE//ɔl//
     
     
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  1. 1 the whole number or amount All of the food has gone. They ate all of it. They ate it all. I invited some of my colleagues but not all. Not all of them were invited. All of them enjoyed the party. They all enjoyed it. His last movie was best of all.
  2. 2(followed by a relative clause, often without that) the only thing; everything All I want is peace and quiet. It was all that I had. Which Word?altogether / all together Altogether and all together do not mean the same thing. Altogether means “in total” or “completely”:We have invited fifty people altogether. I am not altogether convinced by this argument. Have you lost your mind altogether? All together means “all in one place” or “all at once”:Can you put your books all together in this box? Let’s sing “Happy Birthday.” All together now! see also you-all
  3. Idioms most important of all; especially Above all, keep in touch.
    1. 1despite what has been said or expected So you made it after all!
    2. 2used when you are explaining something, or giving a reason He should have paid. He suggested it, after all.
    everything you have They gave their all (= fought and died) in the war. when everything is considered All in all it had been a great success. having two or more uses, functions, etc. It's a corkscrew and bottle opener all in one.
    all or nothing
     
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    used to say that if something is not complete or completely successful, it is not worth anything You have to have a passion for your work—for me, it's all or nothing.
    also; included; in addition She jumped into the river, clothes and all (= with her clothes on).
    (not) at all
     
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    in any way; to any degree I didn't enjoy it at all.
    1. 1despite For all its clarity of style, the book is not easy reading.
    2. 2used to say that something is not important or is of no interest or value to you/someone For all I know she's still living in Boston. You can do what you like, for all I care. For all the good it's done we might as well not have bothered.
    as a total synonym altogether There were twelve of us in all for dinner. That's $25.40 in all. used as a polite reply to an expression of thanks “Thanks very much for your help.” “Not at all, it was a pleasure.”
    put an end to it all
     
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    to kill yourself
See the Oxford Advanced Learner's Dictionary entry: all