Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
a bar, as at the bottom of a typewriter keyboard, pressed to leave a blank space or spaces rather than to produce a character
Used by arrangement with John Wiley & Sons, Inc.
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A bar at the bottom of the keyboard of a typewriter or computer that when pressed down introduces a horizontal space into text, as between words.