| RUL | measuring stick consisting of a strip of wood or metal or plastic with a straight edge that is used for drawing straight lines and measuring lengths |
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| RUL | something regarded as a normative example |
| RUL | a principle or condition that customarily governs behavior |
| RUL | (mathematics) a standard procedure for solving a class of mathematical problems |
| RUL | a rule or law concerning a natural phenomenon or the function of a complex system |
| RUL | a basic generalization that is accepted as true and that can be used as a basis for reasoning or conduct |
| RUL | a systematic body of regulations defining the way of life of members of a religious order |
| RUL | prescribed guide for conduct or action |
| RUL | directions that define the way a game or sport is to be conducted |
| RUL | (linguistics) a rule describing (or prescribing) a linguistic practice |
| RUL | dominance or power through legal authority |
| RUL | the duration of a monarch's or government's power |