If someone is alone in doing something, they are the only person doing it, and so are different from other people. Am I alone in thinking that this scandal should finish his career? = unique Alone is also an adverb. I alone was sane, I thought, in a world of crazy people
emphasis 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. The BBC alone is sending 300 technicians, directors and commentators
By ones self; apart from, or exclusive of others; single; solo; solitary;-applied to a person or thing
Of or by itself; by themselves; without any thing more or any one else; without a sharer; only
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
emphasis You say that one person or thing alone does something when you are emphasizing that only one person or thing is involved. You alone should determine what is right for you They were convicted on forensic evidence alone