regulation

noun
UK /ˌreɡ.jəˈleɪ.ʃən/
US /ˌreɡ.jəˈleɪ.ʃən/

A rule that tells people what they must or must not do.

The school has a regulation that students must wear shoes in the gym.


OTHER MEANINGS

2. The act of controlling or managing something, like keeping a machine or body working properly.

The regulation of the water temperature keeps the fish healthy.

3. Made or required by an official rule.

He wore the regulation uniform to the ceremony.

4. The process of keeping something steady or balanced.

The body's regulation of sugar helps us stay healthy.