Definition of "field-grade officer" [field-grade officer]
A military officer, such as a major, lieutenant colonel, or colonel, ranking above a captain and below a brigadier general. Also called field officer.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.