air·wor·thy (âr?wûr?th?)adj. air·wor·thi·er, air·wor·thi·est Being in fit condition to fly: an airworthy helicopter.air?wor?thi·ness n.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.