one-time (w?n?t?m?)adj.1. or one·time (w?n?t?m?)a. Occurring or undertaken only once: a one-time winner in 1995.b. Having been in the past; former: asked his one-time classmates for help.2. Sports Relating to or being a shot made from a pass that is not stopped prior to shooting.tr.v. one·timed, one·tim·ing, one·times Sports To shoot (a ball or puck) directly from a pass.one?-tim?er 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.