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duodecennial

adjective
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du·​o·​decennial | \ ¦d(y)ü(ˌ)ō+ \

Definition of duodecennial

: occurring once in 12 years

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History and Etymology for duodecennial

Late Latin duodecennium period of 12 years (from Latin duodecim twelve—from duo two + -decim, from decem ten—+ -ennium, from annus year) + English -al

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“Duodecennial.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/duodecennial. Accessed 27 Feb. 2020.

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