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Latin tredecennium + English -al or Latin tredecim + English -ennial


tredecennial sg

  1. (rare nonce word) A period of thirteen years.
    • 1952, Proceedings of the IInd International Congress on Criminology III: “Psychiatry, Psychology, Psychoanalysis”, page 65
      The tredecennial covered by the period of the survey was in a sense a most remarkable one; for it includes, with almost exact divisions, three significant sub periods: the prewar, the war and the post-war.
    • For more examples of usage of this term, see Citations:tredecennial.