1 adj When you are alone, you are not with any other people.
There is nothing so fearful as to be alone in a combat situation..., He was all alone in the middle of the hall.
Alone is also an adverb., adv ADV after v
She has lived alone in this house for almost five years now...
2 adj If one person is alonewith another person, or if two or more people are alone, they are together, without anyone else present.
v-link ADJ, oft ADJ with n
I couldn't imagine why he would want to be alone with me..., My brother and I were alone with Vincent.
3 adj If you say that you are alone or feel alone, you mean that nobody who is with you, or nobody at all, cares about you.
Never in her life had she felt so alone, so abandoned...
4 adv You say that one person or thing alone does something when you are emphasizing that only one person or thing is involved.
n ADV (emphasis)
You alone should determine what is right for you..., They were convicted on forensic evidence alone.
5 adv If you say that one person or thing alone is responsible for part of an amount, you are emphasizing the size of that part and the size of the total amount.
n ADV (emphasis)
The BBC alone is sending 300 technicians, directors and commentators...
6 adj If someone is alonein doing something, they are the only person doing it, and so are different from other people.
v-link ADJ, oft ADJ in -ing/n
Am I alone in thinking that this scandal should finish his career?
Alone is also an adverb., adv ADV prep, n ADV
I alone was sane, I thought, in a world of crazy people.
7 adv When someone does something alone, they do it without help from other people.
ADV after v
Bringing up a child alone should give you a sense of achievement...
8 If you go it alone, you do something without any help from other people.
go it alone phrase V inflects
I missed the stimulation of working with others when I tried to go it alone.
to leave someone or something alone →
let alone →
1 adj A stand-alone business or organization is independent and does not receive financial support from another organization. (BUSINESS) ADJ n
They plan to relaunch it as a stand-alone company.
2 adj A stand-alone computer is one that can operate on its own and does not have to be part of a network. (COMPUTING) ADJ n
...an operating system that can work on networks and stand-alone machines.