Sesquicentenary Definition

noun

A 150 year anniversary.

Wiktionary

Other Word Forms of Sesquicentenary

Noun

Singular:
sesquicentenary
Plural:
sesquicentenaries

Origin of Sesquicentenary

  • sesqui- (“one and a half”) +‎ centenary (“100 year anniversary”)

    From Wiktionary

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sesquicentenary