English

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Etymology

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sēmis +‎ tercentenary

Noun

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sestercentenary (plural sestercentenaries)

  1. A two hundred fiftieth anniversary.
    The city of New York celebrated its sestercentenary in 1903.
    • 2019, Rev'd Dr. Mark Smith, Chapel Report[1], Clare College, Cambridge:
      It’s a splendid description of our Chapel building, which this year marked its sestercentenary.

Adjective

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sestercentenary (not comparable)

  1. Of or relating to such an anniversary, or to a span of two hundred fifty years.
    1982 saw the sestercentenary commemoration of George Washington's birth.
    • 2020, Angus Trumble, On Endeavour in Australian Waters[2], National Museum of Australia:
      To Cook the defeat of the Spanish Armada in 1588 was markedly more recent than the arrival of the Endeavour is to us in this sestercentenary year.
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