Rule is a word with multiple meanings in English:
1. As a noun: an accepted principle or instruction that states the way things are or should be done
2. As a verb: to exercise ultimate power or authority over (an area and its people)
3. In mathematics: a principle or regulation governing conduct or procedure
4. In games: the set of explicit or understood regulations or principles governing conduct within a particular activity
5. Slang usage: to be excellent or superior (e.g., "That movie rules!")