In biology, serving as a menace to enemies; of threatening aspect: somewhat specially used of a strikingly conspicuous coloration. See the quotation.
noun.
Notice beforehand of the consequences that will probably follow continuance in some particular course; admonitory advice to do or to abstain from doing something, as in reference to approaching a probable danger.
noun.
That which warns, or serves to warn or admonish.
noun.
Heed; the lesson taught by or to be learned from a caution given.
noun.
Previous notice: as, a short warning.
noun.
A summons; a call; a bidding.
noun.
A notice given to terminate a business relation, as that of master and servant, employer and employee, landlord and tenant; a notice to quit.