Definition of polysynthesism in US English:

polysynthesism

noun

Linguistics
  • Polysynthesis; polysynthetic character or condition.

Origin

Mid 19th century. From polysynthes- + -ism. Compare slightly earlier polysynthetism, polysyntheticism.

Pronunciation

polysynthesism

/ˌpɒlɪˈsɪnθɪsɪz(ə)m/