home run

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A hit that allows the batter to make a complete circuit of the diamond and score a run.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Baseball) a complete circuit of the bases made by the batter without being put out and without an error on the play; also, the hit on which the batter makes such a circuit; a four-base hit.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun baseball A four-base hit, a homer
• noun idiomatic The portion of a journey that ends at home
• noun idiomatic A success; especially, a popular success.
• noun idiomatic Sexual intercourse.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun something that exactly succeeds in achieving its goal
• noun a base hit on which the batter scores a run