criticalrule
nounUK /ˈkrɪtɪkəl ruːl/
US /ˈkrɪtɪkəl ruːl/
A critical rule is a very important rule that you must always follow.
Wearing a helmet is a critical rule when you ride a bike.
RELATED WORDS
OTHER MEANINGS
2. A rule that decides whether something passes or fails a test.
The critical rule for the science fair is that your project must be your own work.
3. A rule that is needed for a system to work correctly.
In the game, the critical rule is that every player gets a turn.
4. A rule used to judge how good or bad something is.
The judge used a critical rule to score each drawing fairly.