Tra từ monitor - Từ điển Oxford Advanced Learner 8th

moni·tor AW [monitor monitors monitored monitoring] noun, verb BrE [ˈmɒnɪtə(r)] NAmE [ˈmɑːnɪtər]
noun
1. a television screen used to show particular kinds of information; a screen that shows information from a computer
• The details of today's flights are displayed on the monitor.
•a PC with a 17-inch colour monitor
see also ↑VDU
2. a piece of equipment used to check or record sth
•a heart monitor
3. a student in a school who performs special duties, such as helping the teacher
4. a person whose job is to check that sth is done fairly and honestly, especially in a foreign country
• UN monitors declared the referendum fair.
5. a large tropical ↑lizard (= a type of ↑reptile )

Word Origin:
early 16th cent. (in sense 3): from Latin, from monit- ‘warned’, from the verb monere. Sense 2 dates from the 1930s.

Example Bank:
•He was lying there hooked up to a heart monitor.
•The heart monitor shows the strength of your pulse.
•The security staff can see all the outside of the building on their CCTV monitors.

verb
1. ~ sth | ~ what, how, etc… to watch and check sth over a period of time in order to see how it develops, so that you can make any necessary changes
Syn: ↑track
• Each student's progress is closely monitored.
2. ~ sth to listen to telephone calls, foreign radio broadcasts, etc. in order to find out information that might be useful
Verb forms:

Word Origin:
early 16th cent. (in sense 3): from Latin, from monit- ‘warned’, from the verb monere. Sense 2 dates from the 1930s.

Thesaurus:
monitor verb T, often passive
•The animals' heartbeat and temperature are regularly monitored.
track • • watch • • keep track of sb/sth • • keep an eye on sb/sth • |informal keep tabs on sb/sth •
monitor/track/watch/keep an eye on (sb/sth) for sth
monitor/track/watch/keep track of/keep tabs on what/who/where…
monitor/track/watch how…
monitor/track/watch/keep track of/keep tabs on sb/sth's movements
monitor/watch/keep an eye on/keep tabs on a situation
Monitor or track? You monitor sth because the information is necessary and you may need to take action; you track sth because what you find out might be interesting.

Example Bank:
•Television advertising is strictly monitored.
•The authorities will continue to monitor the situation.
•The workers are constantly monitored for exposure to radiation.
•We will now be able to monitor its progress more closely.
•During the war his job was to monitor enemy radio broadcasts.
•Each student's progress is closely monitored over the term.
•Foreign observers monitored voting at polling stations around the country.
•The animals' temperature and heartbeat are regularly monitored.
•The company routinely monitors all its employees' emails.
•Uniformed and undercover police officers monitored the demonstration closely.
•We need to monitor how the situation develops.
•We were warned by a friend in the government that our phone calls were being monitored.