12) three-dimensional. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...Having or appearing to have extension in depth. 3. Treating many aspects of a subject; lifelike: a three-dimensional account of conditions under the new government....

13) Three Age system. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...National Museum of Denmark, the 19th-century Danish archaeologist Christian Thomsen proposed an innovative system based on the assumption of a progression in human...

14) three-ply. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...Consisting of three layers or strands....

15) three-ring circus. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...1. A circus having simultaneous performances in three separate rings. 2. Informal A situation characterized by confusing, engrossing, or amusing activity....

16) three-square. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...Having an equilateral triangular cross section: a three-square file....

17) three-wheeler. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...A vehicle having three wheels, as a small, all-terrain motor vehicle....

18) three-base hit. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...Baseball A base hit that allows the batter to reach third base without being put out. Also called three-bagger, triple....

19) three-bagger. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...See three-base hit....

20) three-card monte. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...A gambling game in which the dealer shows a player three cards, then turns them face down and moves them around, and the player must guess the position of a particular...