Sesquicentennial Definition

sĕskwĭ-sĕn-tĕnē-əl
adjective
Of or ending a period of 150 years.
Webster's New World
noun
A 150th anniversary or its commemoration.
Webster's New World

Other Word Forms of Sesquicentennial

Noun

Singular:
sesquicentennial
Plural:
sesquicentennials

Origin of Sesquicentennial

  • sesqui- (“one-and-a-half") +"Ž centennial (“of 100 years")

    From Wiktionary

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