n. (Abbr. WO)
A military officer, usually a skilled technician or a helicopter pilot, intermediate in rank between a noncommissioned officer and a commissioned officer, having authority by virtue of a warrant.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
