Webster's Revised Unabridged Dictionary · 1913

Warning

Warning , adjective

Giving previous notice; cautioning; admonishing; as, a warning voice.
That warning timepiece never ceased. — Longfellow
Collocations (1)
Warning piece or Warning wheel (Horology) , a piece or wheel which produces a sound shortly before the clock strikes.

Warning , noun

1.
Previous notice.
At a month's warning. — Dryden
A great journey to take upon so short a warning. — L'Estrange
2.
Caution against danger, or against faults or evil practices which incur danger; admonition; monition.
Could warning make the world more just or wise. — Dryden