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From The Collaborative International Dictionary of English v.0.48:
Monitor \Mon"i*tor\, n. [L., fr. monere. See Monition, and cf. Mentor.] 1. One who admonishes; one who warns of faults, informs of duty, or gives advice and instruction by way of reproof or caution. [1913 Webster] You need not be a monitor to the king. --Bacon. [1913 Webster] 2. Hence, specifically, a pupil selected to look to the school in the absence of the instructor, to notice the absence or faults of the scholars, or to instruct a division or class. [1913 Webster] 3. (Zool.) Any large Old World lizard of the genus Varanus; esp., the Egyptian species (Varanus Niloticus), which is useful because it devours the eggs and young of the crocodile. It is sometimes five or six feet long. [1913 Webster] 4. [So called from the name given by Captain Ericson, its designer, to the first ship of the kind.] An ironclad war vessel, very low in the water, and having one or more heavily-armored revolving turrets, carrying heavy guns. [1913 Webster] 5. (Mach.) A tool holder, as for a lathe, shaped like a low turret, and capable of being revolved on a vertical pivot so as to bring successively the several tools in holds into proper position for cutting. [1913 Webster] 6. A monitor nozzle. [Webster 1913 Suppl.] Monitor top, the raised central portion, or clearstory, of a car roof, having low windows along its sides. [1913 Webster]