sesquicentennial

/ˌsɛskwɪsɛnˈtɛni.əl/

SƐSKWꞮSƐNTƐNI · əl (2 syllables)

English Adj

Definition

Occurring every 150 years.

Etymology

From sesqui- (“one-and-a-half”) + centennial (“of 100 years”). By surface analysis, sesqui- + cent- + -ennial.