lieutenant governor noun3 •The state representative of, or second-in-command of a governor, or Crown, who usually acts as the nominal chief executive officer of the realm. •(Canada) The representative of the Crown in the provincial legislatures of Canada. •(US) The next-in-line to the chief executive of a primary political division of the United States of America, such as a state, second to the governor. formslieutenant governors · lieutenant-governors