(physics) Any of several general rules concerning the transitions between the states of a quantum mechanical system; they derive from the symmetry properties of the states and of their interactions

The rule or government of an appendant or dependent country, as to some or all local and internal legislation, by means of a governing power vested in the people within the country itself, in contradistinction to a government established by the dominant country.

(US, law) An exception to the general rule of contract law that acceptance of an offer takes place when communicated. Instead, acceptance takes effect when a letter enters the postal system.

Synonym of first past the post

An observation that, in a parliamentary election, the ration of seats won by each party is proportional to the cube of the percentage of the vote obtained by each party

The principle that one should treat people the way they want to be treated, as opposed to the way you want them to treat you.

Dated form of slide rule.

plural of sliding-rule

plural of work to rule

An ecogeographical rule stating that latitudinal ranges of plants and animals are generally smaller at lower latitudes than at higher latitudes.