(idiomatic) A well-known convention (often the most well-known of a certain field) which supposedly can not or should not be broken.

plural of Command key

plural of second in command

(historical) An old game similar to truth or dare.

A section of a manned spacecraft in which the astronauts live and operate the craft. / (specifically, in relation to the Apollo programme) Shortened form of command and service module.

simple past tense and past participle of c-command

present participle of c-command

Third-person singular simple present indicative form of c-command

(military, law enforcement) The management and logistics of a military or paramilitary force.

Alternative spelling of second-in-command