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

To resist assault or pressure.

(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