lieutenant colonel

Noun

• An army officer in many countries, ranking below a colonel and above a major. Often the commander of a battalion or the executive officer of a regiment.
• An English-language term used as a general categorization for military officer ranks that are the equivalent of lieutenant colonel, the relative rank level is found in most countries.
• An officer in the United States Marine Corps or Royal Marines, of equivalent rank to their counterparts in the army.
• An officer in the United States Air Force, Air Force Reserve, or Air National Guard, ranking below colonel and above major. Often the commander of a squadron or the executive officer of a wing.