Definition of duodecennial
:occurring once in 12 years
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duodecennial
adjective
du·o·decennial
\
¦d(y)ü(ˌ)ō+
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Origin and Etymology of 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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