SEXENNIAL

PRONUNCIATION: (sek-SEN-ee-uhl)

MEANING: noun: An event occurring every six years.
adjective: Happening every six years; lasting for or relating to six years.

ETYMOLOGY: From Latin sex (six) + annus (year). Earliest documented use: 1646.
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HEXENNIAL - like a six-carbon unsaturated hydrocarbon with a low flash point

SELENNIAL - moonstruck

SEXENONIAL - characterized by fifteens, like the game of cribbage