Definition of polysyllabism in US English:

polysyllabism

noun

  • 1Linguistics. The property of having or using words of many syllables; this as a feature of a language.

  • 2Polysyllabic style; especially (the use of) abstruse or unnecessarily complex language.

Origin

Mid 19th century. From polysyllab- + -ism, perhaps after French polysyllabisme.

Pronunciation

polysyllabism

/ˌpɒlɪˈsɪləbɪz(ə)m/