flex·ion (fl?k?sh?n)n.1. also flec·tion Anatomy a. The act of bending a joint or limb in the body by the action of flexors.b. The resulting condition of being bent.2. A part that is bent.[Latin flexi?, flexi?n-, a bending, from flexus, past participle of flectere, to bend.]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.flexion (?fl?k??n) n1. (Physiology) the act of bending a joint or limb2. (Physiology) the condition of the joint or limb so bent3. a variant spelling of flection ?flexional adj ?flexionless adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014flex?ion (?fl?k ??n) n. 1. a. the act of bending a limb. b. the position that a limb assumes when it is bent. 2. a bent part. [1595?1605;