Definition: Colonel in English means a high ranking officer, such as a general or admiral. Definition: The name "Colonel" is used by most military organizations for their top officers who serve at least two years after promotion to the rank of Lieutenant Colonel. They are called "Colons," "colonels", or "Colonel's". In many military organizations, the term "Colony" refers to a separate unit or organization. Colonels are responsible for planning and executing operational operations with other units within their battalion (or regiment).