The phrase "a definite rule" is correct and usable in written English.
It can be used when referring to a specific guideline or principle that is clear and unambiguous.
Example: "In our organization, there is a definite rule that all employees must adhere to the code of conduct."
Alternatives: "a clear guideline" or "an established principle."
But the greatest advantage of this cycle was that it laid down a lunar calendar that possessed a definite rule for inserting intercalary months and kept in step with a cycle of the tropical years.
A very large number of decisions have dealt with the matter; and the nearest approach to a definite rule which can be extracted from them is that, while the difference need not be great, the classification must not be arbitrary or capricious, but must bear some just and reasonable relation to the object of the legislation.
In 1638 the deserted building was occupied by the Solitaires (hermits), pious laymen and secular priests who lived without vows or a definite rule under the spiritual guidance of Jean Duvergier de Hauranne, abbot of Saint-Cyran and a friend of Cornelius Jansen.
But it is also a definite rule of the common law that a confessional statement cannot be voluntary if it is preceded by an inducement held out by a person in authority and the inducement has not been removed before the statement is made..."....
Indeed, of the last importance that we should do this; for, if the jury are left without any definite rule to guide them, it will, in such cases as these, manifestly lead to the greatest injustice.
for if the jury are left without any definite rule to guide them, it will, in such cases as these, manifestly lead to the greatest injustice". From a less personal perspective the invention also affected a modernization by enhancing efficiency as a result of taking matters out of the hands of the jurors.
While there are never any definite rules about what you have to put in your bedroom, here are some suggestions for creating the right atmosphere.
For as yet no definite rule has been laid down in this matter.
The history of the citizenship clause of the Fourteenth Amendment and indeed the entire history of the United States, suggests that political leaders should think long and hard before they try to change the "settled and definite rule of international law, generally recognized by civilized nations," which was "the ancient rule of citizenship by birth within the dominion".
The Court noted this was the "settled and definite rule of international law, generally recognized by civilized nations," was "the ancient rule of citizenship by birth within the dominion," and in the Fourteenth Amendment "the fundamental principle of citizenship by birth within the dominion was reaffirmed in the most explicit and comprehensive terms".
