Definition of migrationism in English:

migrationism

Pronunciation /mʌɪˈɡreɪʃ(ə)nɪz(ə)m/ /mʌɪˈɡreɪʃənɪz(ə)m/

noun

Archaeology Anthropology
  • A theory of culture history in which migration is held to be the most significant factor in cultural dissemination; adherence to this theory.

    Since the later 20th century, migration has ceased to be regarded as a major factor in cultural dissemination.

Origin

1970s. From migration + -ism.