(idiomatic) To work slowly by strictly following all work rules, usually in a work-to-rule job action, as part of unionized labor protest.

(law) The method of strictly interpreting a statute according to the meaning, established by convention, of the words used therein.

(trigonometry) law of cosines

(trigonometry) law of sines

(chemistry) A rule in chemistry that states that the sum of the hydrogen valence and the maximum oxygen valence is equal to eight.

(obsolete) Algebra.

(gematria, very rare in print) The rule according to which one digit may be added to or subtracted from the gematric value of a word.

The ecogeographic principle that, within a broadly distributed taxonomic clade, populations and species of larger size are found in colder environments, and species of smaller size are found in warmer regions.

plural of mob rule

(organic chemistry) A rule describing the outcome of certain addition reactions in organic chemistry.