304 Full Form. Full Meaning of 304 Find long form and abbreviation, slang or definition of 304. What does 304 mean? What does 304 stand for? We are providing world largest and most comprehensive acronyms, names, abbreviations database directory on the Internet. Our data base contains more than 8,00,000 terms abbreviations and acronyms. You can also search unique terms more than 4,00,000 general Comprehensive words.