tredecennial en · NOUN
Etymology
Latin trēdecennium + English -al or Latin trēdecim + English -ennial
Meanings
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(nonce-word, rare, singular) A period of thirteen years.
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.
1952, Proceedings of the IInd International Congress on Criminology III: “Psychiatry, Psychology, Psychoanalysis”, page 65