Baath PartyPronunciation: /bɑːθ/ (also Ba'ath Party)Definition of Baath Party a pan-Arab socialist party founded in Syria in 1943. Different factions of the Baath Party hold power in Syria and formerly held power in Iraq. Derivatives Baathism noun Baathist adjective & noun Origin:Baath, from Arabic ba‘ṯ 'resurrection, renaissance'Baath Party in other Oxford dictionaries Definition of Baath Party in the US English dictionary