Definition of polysyllabicism in US English:

polysyllabicism

noun

rare
  • Polysyllabic or abstruse style.

Origin

Early 19th century; earliest use found in William Taylor (1765–1836), reviewer and translator. From polysyllabic + -ism.

Pronunciation

polysyllabicism

/ˌpɒlɪsɪˈlabɪsɪz(ə)m/