polygenesis noun. [pɒlɪ'dʒɛnɪsɪs] M19.
[from POLY- + -GENESIS.]
1. Origination from several independent sources; esp. the (hypothetical) origination of a race or species from a number of independent stocks. Cf. POLYGENY. M19.

2. Linguistics. (A theory proposing) the origination of languages from a plurality of independent sources. M20.

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