Lieutenant, company grade officer, the lowest rank of commissioned officer in most armies of the world The lieutenant normally commands a small tactical unit such as a platoon. / luˈten·ənt / add to word list a naval officer of middle rank, above an ensign Or a military officer of the lowest rank (definition of lieutenant from the cambridge academic content dictionary © cambridge university press) Lieutenant noun a person who holds a position auxiliary to another and assumes some of the superior's responsibilities: If you refer to someone as a person's lieutenant, you mean they are that person's assistant, especially their main assistant, in an organization or activity
Collins cobuild advanced learner’s dictionary (military, us) in the us army, air force and marines, holding the rank above second lieutenant and below captain Both ranks may be referred to as lieutenant or as the complete forms of the ranks. See examples of lieutenant used in a sentence. So a lieutenant is a placeholder, one who takes the place or of or is deputy to a superior officer Military, a lieutenant in the navy is the equivalent of a captain in the army.
