abiogenesisEnglishOxford Dictionary of Englishabiogenesis /ˌeɪbʌɪə(ʊ)ˈdʒɛnɪsɪs / ▸ noun [mass noun] 1 the original evolution of life or living organisms from inorganic or inanimate substances: to construct any convincing theory of abiogenesis, we must take into account the condition of the Earth about 4 billion years ago. 2 historical old term for spontaneous generation – ORIGIN late 19th century: from a-1 ‘not’ + Greek bios ‘life’ + genesis.