There are a number of ways of warning someone. The meaning of warning is the act of warning : A statement telling of or an indication providing evidence of impending danger, difficulty, or misfortune: Warnings can be weak or strong. See examples of warning used in a sentence. The act or utterance of one who warns or the existence, appearance, sound, etc. , of a thing that warns. The state of being warned. How to use warning in a sentence. The government issued a warning about. A warning is something that makes us aware of possible danger. Warning synonyms, warning pronunciation, warning translation, english dictionary definition of warning. A warning is an advance notice of something that will happen, often something unpleasant or dangerous. The soldiers opened fire without warning.