1. A flag; a banner; a standard; especially, the national flag, or a banner indicating nationality, carried by a ship or a body of soldiers; as distinguished from flags indicating divisions of the army, rank of naval officers, or private signals, and the like. Hang up your ensigns, let your drums be still. (Shak)
4. Formerly, a commissioned officer of the army who carried the ensign or flag of a company or regiment. A commissioned officer of the lowest grade in the navy, corresponding to the grade of second lieutenant in the army.
in the British army the rank of ensign was abolished in 1871. In the united states army the rank is not recognised; the regimental flags being carried by a sergeant called the colour sergeant. Ensign bearer, one who carries a flag; an ensign.