GoliathPronunciation: /gəˈlʌɪəθ/Definition of Goliath (in the Bible) a Philistine giant, according to one tradition slain by David (1 Sam. 17), but according to another slain by Elhanan (2 Sam. 21:19). (as noun also goliath) a person or thing of enormous size or strength:the two unassuming hippies took on a corporate GoliathGoliath in other Oxford dictionaries Definition of Goliath in the US English dictionary