Definition of "Tenkaichi Budoukai." 

"Tenkaichi Budoukai" is written completely in kanji; if we separate 
the romaji according to each kanji, it would look like this: 
"Ten Kai Chi Bu Dou Kai" 

For those with even rudimentry Japanese, you should be able to 
recognize that "Ichi" means "one." Here's a word-by-word translation: 

Ten - Sky, Heaven 
Kai - Beneath, under 
Chi - (Number) One 
Bu - Martial Arts, fighting technique 
Dou - Way of 
Kai - Meeting 

"Tenka" (Under heaven) is used to refer to "the world," as everything 
in this world is beneath the skies / under heaven. 

"Budou" means martial arts, or "the way (art) of fighting." 

Putting the rest together, a fairly concise translation of "Tenkaichi 
Budoukai" would be "The World's Best Martial Artist Tournament." 
 
 
 
 

Results of the 1st 3 Tenkaichi Budoukai's in manga/anime 

The 21nd Tenkaichi Budoukai: 

Champion: Master Roshi (Kamesennin) 
Runner-up: Son Goku 

The 22nd Tenkaichi Budoukai: 

Champion: Tien 
Runner-up: Son Goku 

The 23rd Tenkaichi Budoukai: 

Champion: Son Goku 
Runner-up: Piccolo 

The Cell Game: 

Champion: Son Gohan 

The 24th Tenkaichi Budoukai: 

Champion: Mr. Satan 

The 25th Tenkaichi Budoukai: 

Adult Division Champion: Mr. Satan 
Adult Division Runner-up: No. 18 
Children Division Champion: Chibi Trunks 
Children Division Runner-up: Son Goten 

Note: In all the tournaments to follow, Mr. Satan is the champion, while Mr. 
Buu is the runner-up.. Basically Mr. Satan cheats in letting Mr. Buu 
fight with everyone else first, and then to throw the match to Mr. 
Satan.