triennial

Part of speech: adverb

Triennially.

Part of speech: adjective

Occurring every third year; also, lasting three years.

Part of speech: noun

A ceremony observed every three years.

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Usage examples "triennial":

  1. At a triennial convention of that body held at Richmond, there was passed a resolution opening the pulpits of the Episcopal Church to clergymen of other denominations. - "Love's Final Victory", Horatio.
  2. This appears on our Triennial Catalogue until 1768, when the minds of men began to be imbued with the notion of equality. - "A Collection of College Words and Customs", Benjamin Homer Hall.
  3. In 1869, a law was passed, making the Storthings annual, instead of, as hitherto, triennial. - "The Story of Norway", Hjalmar H. Boyesen.