constantrule
nounUK /ˈkɒnstənt ruːl/
US /ˈkɑːnstənt ruːl/
A constantrule is a rule that never changes and must always be followed.
The teacher said that being kind is a constantrule in our classroom.
OTHER MEANINGS
2. A rule that stays the same in a game or sport.
In chess, moving the knight in an L-shape is a constantrule.
3. A rule in math that always works the same way.
Adding zero to a number is a constantrule in math.
4. A family rule that everyone follows all the time.
Washing hands before dinner is a constantrule at our house.