sexennial en · ADJ
Etymology
From New Latin sexennialis (16th century), equivalent to sexennium + -al.
Meanings
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(not-comparable) Pertaining to a period of six years; taking place once every six years.
[T]his evil was exterior and accidental, and not so much the vice of their constitution itself, as it must be in your new contrivance of sexennial elective judicatories.
1790, Edmund Burke, Reflections on the Revolution in France: