监察 means 'to supervise' or 'oversight' — a formal, institutional action of monitoring activities to ensure compliance with laws, rules, or standards. The character 监 (jiān) originally depicted a person watching from above, conveying observation and scrutiny; 察 (chá) means 'to examine carefully' or 'to investigate', often implying thoroughness and judgment. Together, 监察 emphasizes authoritative, systematic supervision — typically carried out by government agencies, internal audit departments, or regulatory bodies.

This term is commonly used in official, administrative, and legal contexts: for example, the National Supervisory Commission (国家监察委员会) oversees public officials. It is rarely used in casual speech or personal situations — you wouldn’t say 监察 your friend’s homework. Instead, it signals seriousness, accountability, and institutional responsibility, especially concerning ethics, legality, and performance in public service or corporate governance.