monitoring

(noun) the act of observing something (and sometimes keeping a record of it). Example: "The monitoring of enemy communications plays an important role in war times."

(verb) keep tabs on; keep an eye on; keep under surveillance. Synonyms: monitor, supervise. Examples: "We are monitoring the air quality." "The police monitor the suspect's moves."

(verb) check, track, or observe by means of a receiver. Synonyms: monitor.