Hypertext Webster Gateway: "sexennial"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Sexennial \Sex*en"ni*al\, a. [L. sexennium a period of six
years, sexennis of six years; sex six + annus a year. See
{Six}, and {Annual}.]
Lasting six years, or happening once in six years. -- n. A
sexennial event.
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