home plate definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Baseball the base that the batter stands beside and over which the pitcher must throw the ball for a strike: it is the last base that a base runner must reach safely to score a run
home plate definition by American Heritage Dictionary
A base, usually consisting of a hard rubber slab, at one of the corners of a diamond at which a batter stands when hitting and which a base runner must finally touch in order to score.