I will give brainliest, as well as 40 points if it is correct monitor:

1. One who admonishes; one who warns of faults, informs of duty, or gives advice and instruction by way of reproof or caution.

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.

3. Any large Old World lizard of the genus Varanus; esp., the Egyptian species (V. Niloticus), which is useful because it devours the eggs and young of the crocodile. It is sometimes five or six feet long.

4. An ironclad war vessel, very low in the water, and having one or more heavily-armored revolving turrets, carrying heavy guns.

Which definition gives the accurate meaning for monitor as it is used in