(soccer) Collectively, the two Scottish football teams Rangers and Celtic, both based in Glasgow, which are the most successful teams in Scotland. They have a fierce and long-standing rivalry.

(law) A business formed by one or more lawyers to engage in the practice of law.

Alternative spelling of interfirm

the guaranteed power provided by a power plant or transmission system

plural of firm error

(electronics, computing) A type of error where a signal or datum becomes wrong and stays wrong until the equipment is power-cycled, but does not physically damage the equipment's hardware.

(computing) A kind of link within a file system having aspects of both hard links and soft links.

plural of firm link

(idiomatic, intransitive, or transitive with to) to keep to a conviction, practice, etc., unwaveringly

group that participates in football hooliganism or other sports-related hooliganism