Meaning

1. monitor, screen (output device that displays information in pictorial or textual form)
2. official magazine or news program having the word “monitor” in the title in which resolutions and orders of state authorities are published
3. monitor (one of a class of relatively small armored warships with only one or two turrets (but often carrying unusually large guns for a warship of its size), usually designed for shore bombardment or riverine warfare rather than open-ocean combat)