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Definition of alone adjective from the Oxford Advanced American Dictionary

Oxford3000

alone

adjective
/əˈloʊn/ alone pronunciation American
[not before noun], adverb
 
1 without any other peopleI 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 without the help of other people or thingsIt's hard bringing up children alone.The assassin said he had acted alone.3 lonely and unhappy or without any friendsCarol felt all alone in the world.I've been so alone since you went away.4 used after a noun or pronoun to show that the person or thing mentioned is the only oneYou can't blame anyone else; you alone made the decision.5 used after a noun or pronoun to emphasize one particular thingThe shoes alone cost $200.IDIOMS

go it alone

to do something without help from anyone
Andrew decided to go it alone and start his own business.go it alone

leave/let someone alone

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 alonelet alone

leave/let something alone

to stop touching, changing, or moving something
I've told you before—leave my things alone!leave alonelet alone

let 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.let alone

stand alone

1 to be independent or not connected with other people, organizations, or ideasThese 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 to be not near other objects or buildingsThe arch once stood alone at the entrance to the castle.stand alone
Usage notesWhich Word: alone lone lonelyAlone, 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 walksLonely/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