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

(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.

To resist assault or pressure.

plural of firming agent

A company of swindlers who obtain goods on pretence of being established in business, and then decamp without payment to do the same elsewhere.

(theater, dated) Well prepared, having thoroughly memorized one's part.

Alternative spelling of interfirm

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

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.