What's the derivative noun of the verb 'surveil'?

✅ "Surveil" is a verb which means to closely observe someone or something especially in a secretive way.

🔹 The police were surveilling the suspect for any unusual activity.
🔹 The government has been accused of surveilling its citizens' online activity.
🔹 Then we would move people around to surveil the person and also use technical surveillance — wiretaps and so on. (The New Yorker)
🔹 And that's led to a huge transfer of power from the people who are surveilled upon, to those who control the surveillance complex. (The Guardian))

✅ "Surveillance" is a noun that refers to the act of surveilling or the condition of being surveilled.

🔹 The city centre is under constant surveillance to maintain public safety.
🔹 Thanks to the surveillance footage, the police were able to catch the thief.
🔹 Hacking is one of the most intrusive surveillance capabilities available to any intelligence agency, and its use and safeguards surrounding it should be the subject of proper debate. (The Guardian)
🔹 He believes state surveillance had expanded well beyond a point that is acceptable and that people needed to know about it. (The Guardian)

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