Longman Dictionary of Contemporary English homepage

monitor

1 verb
     
mon‧i‧tor1 S3 W3 [transitive]
1 to carefully watch and check a situation in order to see how it changes over a period of time:
Patients who are given the new drug will be asked to monitor their progress.
The government is monitoring the situation closely.
The temperature is carefully monitored.
monitor what/how etc
We need a better system for monitoring what is going on.
➔ see usage note control2
2PM to secretly listen to other people's telephone calls, foreign radio broadcasts etc:
He suspected that his phone calls were being monitored.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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