An authoritative command is an ORDER or BEHEST that is given with authority and is expected to be followed. It is usually issued by someone in a position of power, such as a leader or supervisor. The term 'an authoritative command' can be broken down into two crossword solutions: ORDER (5 letters) and BEHEST (6 letters). ORDER is a noun meaning a command or instruction given by a superior, while BEHEST is a noun meaning an authoritative command or request.