(a) becoming without any person or anything else; only.
(a) Considered independently from others of the identical course.
(a) Without others: sang alone while the choir listened.
(a) Without help: carried the suitcases alone.
(a) Exclusively; just: The burden of proof rests in the prosecution alone.
Apart from another or other people; single or singly; individual or solitarily; without the aid or company of another: placed on someone or thing: since, to be or continue to be alone; to stroll alone.
Only; towards exclusion of other individuals or things; sole or entirely: since, he alone stayed.
Without a parallel; above or beyond others; unique.
How would you define alone?