Dictionary.net

• A commissioned or noncommissioned officer posted in the rear of a line, or on the flank of a column, of soldiers, to rectify mistakes and insure steadiness and promptness in the ranks.

2010 - New Age Dictionary Database
By Oddity Software

• A commissioned or noncommissioned officer posted in the rear of a line, or on the flank of a column, of soldiers, to rectify mistakes and insure steadiness and promptness in the ranks.

1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.