I. ˈwȯr-niŋ noun
Date: before 12th century
1. : the act of warning : the state of being warned
he had warning of his illness
2. : something that warns or serves to warn ; especially : a notice or bulletin that alerts the public to an imminent hazard (as a tornado, thunderstorm, or flood)
II. adjective
Date: 1511
: serving as an alarm, signal, summons, or admonition
a warning bell
a warning shot
• warn·ing·ly ˈwȯr-niŋ-lē adverb