What does alone mean?
The definition of alone
A*lone”, a.
Etym: [All + one. OE. al one all allone, AS. an one, alone. See All, One, Lone.]

1 Quite by one’s self; apart from, or exclusive of, others; single; solitary; — applied to a person or thing. Alone on a wide, wide sea. Coleridge. It is not good that the man should be alone. Gen. ii. 18.
2 Of or by itself; by themselves; without any thing more or any one else; without a sharer; only. Man shall not live by bread alone. Luke iv. 4. The citizens alone should be at the expense. Franklin.
3 Sole; only; exclusive. [R.] God, by whose alone power and conversation we all live, and move, and have our being. Bentley.
4 Hence; Unique; rare; matchless. Shak.

Note: The adjective alone commonly follows its noun. To let or leave alone, to abstain from interfering with or molesting; to suffer to remain in its present state.

A*lone”, adv.
Solely; simply; exclusively.