(idiomatic) In general; most often.

simple past tense and past participle of rule on

present participle of rule on

Based on rules.

A surname.

(Internet) A type of directive in CSS (Cascading Style Sheets) that is prefixed with the at sign @.

(programming) A rule by which compilers are allowed to apply any optimizing transformation to a program provided that it makes no change to the observable behavior of the program.

(slang, derogatory) Someone who attempts to take advantage of a given set of rules, usually by using an overly-literal interpretation that is contrary to their intent, or by selectively choosing which rules take precedence in a given situation.

(intransitive, slang, derogatory) To behave as a rules lawyer.

Australian rules football.