Etymology: First attested w:1548, 1548, from coronel, from Italian colonnello the officer of a small company of soldiers (column) that marched at the head of a regiment, from compagna colonnella little column company, from columna pillar.
- a commissioned officer in the army, air force, or marine corps. In U.S. military, it ranks above a lieutenant colonel and below a brigadier general
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Full Definition of colonel