Meaning

noun a firm rebuke

noun cautionary advice about something imminent (especially imminent danger or other unpleasantness)

noun a summons issued after the filing of a libel or claim directing all parties concerned to show cause why the judgment asked for should not be granted

originFrom Anglo-Norman monicion, Middle French monicion, and their source, Latin monitiō (“warning, admonition”).

Etymology from Wiktionary, CC BY-SA 3.0