hackathonEnglishOxford New American Dictionaryhackathon /ˈhakəˌTHän, ˈhækəˌθɑn / ▸ noun informal an event in which a large number of people meet to engage in collaborative computer programming: a series of 48-hour hackathons to build new web and mobile services. – ORIGIN 1980s : from hack1, on the pattern of marathon.