Definition of alone adjective from the Oxford Advanced American Dictionary

      

    alone

     adjectiveadverb
    adjective
    NAmE//əˈloʊn//
     
    [not before noun]adverb
     
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  1. 1without any other people I don't like going out alone at night. He lives alone. Finally the two of us were alone together. She was sitting all alone in the hall. Tom is not alone in finding Rick hard to work with.
  2. 2without the help of other people or things It's hard bringing up children alone. The assassin said he had acted alone.
  3. 3lonely and unhappy or without any friends Carol felt all alone in the world. I've been so alone since you went away.
  4. 4used after a noun or pronoun to show that the person or thing mentioned is the only one You can't blame anyone else; you alone made the decision.
  5. 5 used after a noun or pronoun to emphasize one particular thing The shoes alone cost $200.
  6. Idioms
    go it alone
     
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    to do something without help from anyone Andrew decided to go it alone and start his own business.
    leave/let somebody alone
     
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    to stop annoying someone or trying to get their attention She's asked to be left alone but the press photographers follow her everywhere.
    leave/let something alone
     
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    to stop touching, changing, or moving something I've told you before—leave my things alone!
    used after a statement to emphasize that because the first thing is not true or possible, the next thing cannot be true or possible either There isn't enough room for us, let alone any guests. I didn't have any clothes, let alone a passport.
      stand alone
       
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    1. 1to be independent or not connected with other people, organizations, or ideas These islands are too small to stand alone as independent states. The problems that research is designed to solve do not stand alone, but are part of a wider context.
    2. 2to be not near other objects or buildings The arch once stood alone at the entrance to the castle.
Which Word?alone / lone / lonely Alone, and on your own/by yourself (which are less formal and are the normal phrases used in spoken English) describe a person or thing that is separate from others. They do not mean that the person is unhappy:I like being alone in the house. I’m going to London by myself next week. I want to finish this on my own (= without anyone’s help). Lone/solitary/single mean that there is only one person or thing there;lone and solitary may sometimes suggest that the speaker thinks the person involved is lonely:a lone jogger in the park long, solitary walks Lonely/lonesome mean that you are alone and sad:a lonely child Sam was very lonely when he first moved to New York. The dog let out a lonesome howl.It can also describe places or activities that make you feel lonely:a lonely house the lonesome prairie
See the Oxford Advanced Learner's Dictionary entry: alone