ultimaterule
nounUK /ˈʌltɪmət ruːl/
US /ˈʌltəmət ruːl/
The ultimaterule is the most important rule that everyone must follow.
The teacher said the ultimaterule is to always be kind to each other.
OTHER MEANINGS
2. The last rule in a game or list that decides everything.
If no one wins, the ultimaterule says the youngest player gets a turn.
3. A rule that cannot be changed by anyone.
The king's ultimaterule was that no one could enter the garden.
4. The most powerful rule in a computer program.
The ultimaterule stops the game when time runs out.