polygenesis
/ˌpɒlɪˈdʒenɪsɪs/noun
mass noun
1- origination from several independent sources, in particular多源, 尤指：
1.1
- Biology the hypothetical origination of a race or species from a number of independent stocks【生】（人种或物种）多源发生说。比较POLYGENY.
1.2
- the hypothetical origination of language or of a surname from a number of independent sources in different places at different times（语言或姓的）多源说。