From WordNet (r) 2.0 (August 2003) [wn]:
Gautama
n : founder of Buddhism; worshipped as a god (c 563-483 BC)
[syn: Buddha, the Buddha, Siddhartha, Gautama,
Gautama Siddhartha, Gautama Buddha]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Gautama \Gau"ta*ma\ (gou"t[.a]*m[.a]), prop. n.
The family name of Buddha, the founder of Buddhism; born
ca. 563 b.c., died ca. 483 b.c. In He is worshipped by
Buddhists as a god. See Buddha. [Also spelled Gotama.]
Syn: Buddha, the Buddha, Siddhartha, Gotama, Gautama Buddha.
[WordNet 1.5]