Sesquicentennial

//ˌsɛskwɪsɛnˈtɛni.əl// adj, noun

adj, noun ·Uncommon ·Advanced level

Definitions

Noun
  1. 1
    A 150th anniversary.

    "The city celebrated its sesquicentennial last year."

  2. 2
    the 150th anniversary (or the celebration of it) wordnet
Adjective
  1. 1
    Occurring every 150 years. not-comparable
  2. 2
    Of, or relating to a sesquicentenary. not-comparable

Synonyms

All synonyms
anniversaryannual holidaybicentenarybicentennialbiennialbirthday

Example

More examples

"New York City has kicked off a year-long celebration to mark the 150th anniversary of Central Park, which was created from barren swampland in the heart of the city. It is considered the ultimate everyman's playground. The city will honor the park's sesquicentennial with a host of concerts, fireworks and special events."

Etymology

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

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.