Dictionary definition · warning
noun
- a message informing of danger"a warning that still more bombs could explode"
- cautionary advice about something imminent (especially imminent danger or other unpleasantness)"a letter of admonition about the dangers of immorality"
- notification of something, usually in advance"they gave little warning of their arrival"
adjective
- serving to warn"shook a monitory finger at him"
Source: Open English WordNet (CC BY 4.0).