IPA: /ˌpɒlɪˈdʒɛnɪsɪs/
KK: /pɑlɪˈdʒɛnɪsɪs/
The process of deriving a species or type from multiple ancestors or sources.
The theory of polygenesis suggests that humans may have originated from several different ancestral groups.
Polygenesis → It is formed from "poly-" (from Greek "polus", meaning many) and "genesis" (from Greek "genesis", meaning origin or creation). The word refers to the concept of multiple origins or beginnings.
Think of 'many' ('poly-') origins or 'creations' ('genesis') — that's what polygenesis means.