What is Goliath? Definition and meaning: GOLIATH go-li'-ath (golyath; Goliath): (1) The giant of Gath, and champion of the Philistine army (1. The name Goliath does not mean Giant. It means Exposer, and Israel's occupation with the male foreskin and the mammalian reproductive cycle — with God as. Goliath meaning, definition, what is Goliath: a very large and powerful person or organization. Learn more.