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1. Sports One who sets the pace in a race. Also called pacer, pacesetter.
2. A leader in a field: the fashion house that is the pacemaker. Also called pacesetter.
a. A part of the body, such as the mass of muscle fibers of the sinoatrial node, that sets the pace or rhythm of physiological activity.
b. Any of several usually miniaturized and surgically implanted electronic devices used to stimulate or regulate contractions of the heart muscle.
pace′mak′ing adj. & 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.
1. (General Sporting Terms) sport the act of setting a pace for race competitors
2. (Medicine) med the maintenance of physiological activity
3. (General Sporting Terms) sport relating to the setting of a pace for race competitors
4. (Medicine) med relating to the maintenance of physiological activity
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014