corerule
nounUK /ˈkɔːruːl/
US /ˈkɔːrruːl/
A corerule is a special rule that is the most important one to follow.
The teacher said the corerule of the class is to be kind to everyone.
OTHER MEANINGS
2. The most basic rule that other rules are built on.
Sharing is a corerule of playing fair.
3. A rule that everyone in a group must always follow.
Wearing a helmet is a corerule for riding bikes.
4. The first and most important rule in a set.
The corerule of the game is to take turns.