monitor

A monitor is a device or a person who watches or checks to see that all is going well. If you're babysitting, you might use a baby monitor so you can hear if the baby cries in its sleep.

Monitor can be used as a noun or a verb, both of which are concerned with watching over someone or something. A heart monitor displays the rhythm of your heart. A hall monitor is a person who checks to see that students aren't wandering the halls. If you are monitoring your grades, you are keeping track of them to see if they go up or down. And some parents buy a program that will monitor your Internet use, though you might think that this is an invasion of privacy.

Primary Meanings of monitor

1.
nv
someone who gives a warning so that a mistake can be avoided
keep tabs on; keep an eye on; keep under surveillance
2.
n
display produced by a device that takes signals and displays them on a television screen or a computer monitor
3.
n
any of various large tropical carnivorous lizards of Africa and Asia and Australia; fabled to warn of crocodiles
Full Definitions of monitor
1

n someone who gives a warning so that a mistake can be avoided

Synonyms:
admonisher, reminder
Type of:
defender, guardian, protector, shielder
a person who cares for persons or property

n someone who supervises (an examination)

Synonyms:
proctor
Types:
invigilator
someone who watches examination candidates to prevent cheating
Type of:
supervisor
one who supervises or has charge and direction of

n electronic equipment that is used to check the quality or content of electronic transmissions

Types:
television monitor, tv monitor
monitor used in a studio for monitoring the program being broadcast
Type of:
electronic equipment
equipment that involves the controlled conduction of electrons (especially in a gas or vacuum or semiconductor)

n a piece of electronic equipment that keeps track of the operation of a system continuously and warns of trouble

Types:
cardiac monitor, heart monitor
a piece of electronic equipment for continual observation of the function of the heart
electronic fetal monitor, electronic foetal monitor, fetal monitor, foetal monitor
an electronic monitor that monitors fetal heartbeat and the mother's uterine contractions during childbirth
Type of:
electronic equipment
equipment that involves the controlled conduction of electrons (especially in a gas or vacuum or semiconductor)

v keep tabs on; keep an eye on; keep under surveillance

“we are monitoring the air quality”
“the police monitor the suspect's moves”
Synonyms:
supervise
Types:
sleuth, snoop, spy, stag
watch, observe, or inquire secretly
Type of:
observe
watch attentively

v check, track, or observe by means of a receiver

Type of:
observe
watch attentively
2

n display produced by a device that takes signals and displays them on a television screen or a computer monitor

Synonyms:
monitoring device
Types:
computer monitor
a device that displays signals on a computer screen
Type of:
display, video display
an electronic device that represents information in visual form
3

n any of various large tropical carnivorous lizards of Africa and Asia and Australia; fabled to warn of crocodiles

Synonyms:
monitor lizard, varan
Types:
African monitor, Varanus niloticus
destroys crocodile eggs
Komodo dragon, Komodo lizard, Varanus komodoensis, dragon lizard, giant lizard
the largest lizard in the world (10 feet); found on Indonesian islands
Type of:
lizard
relatively long-bodied reptile with usually two pairs of legs and a tapering tail