Warning p. pr. & vb. n. : of Warn

Warning a. : Giving previous notice; cautioning; admonishing; as, a warning voice.

Warning n. : Previous notice.

Warning n. : Caution against danger, or against faults or evil practices which incur danger; admonition; monition.

Example:
What is with the Warning label saying a product contains chemicals known to California to cause cancer etc?

Taxonomy
The Warning, free encyclopedia, song, search, song by Black, templates, vandalize, free dictionary, Signal, Music, Black Sabbath, album Black Sabbath, Nine Inch Nails, Eminem, New South Wales, Australia, disambiguation pages, Personal tools, Interaction.

Defination from the web:
warn users who vandalize Wikipedia articles, see Wikipedia:Template messages/User talk namespace#Warnings. ... "Warning," a song by Black Sabbath on the album Black Sabbath "The Warning," a song by Nine Inch Nails on the album Year Zero " ...