Webster's Revised Unabridged Dictionary · 1913

Alone

Alone ({not transcribed}) , adjective

[All + one. Old English al one all allone, Anglo-Saxon ān 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. [Rare]
God, by whose alone power and conversation we all live, and move, and have our being. — Bentley
4.
Hence; Unique; rare; matchless. — Shakespeare

The adjective alone commonly follows its noun.

Collocations (1)
To let alone or To leave alone , to abstain from interfering with or molesting; to suffer to remain in its present state.

Alone , adverb

Solely; simply; exclusively.