lieutenant colonel

Short definition from Wiktionary

Noun

1. 1
   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.
2. 2
   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.
3. 3
   An officer in the United States Marine Corps or Royal Marines, of equivalent rank to their counterparts in the army.
4. 4
   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.
5. 5
   Alternative form of lieutenant colonel.
6. 6
   An army officer title for the rank of lieutenant colonel, found in many countries.
7. 7
   A military officer title used in English for ranks that are treated as the equivalent to the rank of lieutenant colonel, in which the equivalent ranks are found in most countries.