duodecennial
biennial
undecennary
biannual
biweekly
duodecade
fortnightly
twice-yearly
octennial
undecennial
biennially
biyearly
bimonthly
bimensal
bimestrial
sesquiannual
biannually
semi-annually
half-yearly
semiannually
semiweekly
bimensual
tredecennial
semiannual
sesquiennial
septennially
twice-weekly
sextennial
octennially
semi-weekly
multiyear
sexennial
yearslong
periodic
biquarterly
biennary
sexennially
bimillennial
sextennially
decennial
yearly
circannual
annual
triannually
semperannual
vicennial
bihourly
interannual
Adar Sheni
octennium
Veadar
two weeks
enneatical
fortnight
semidiurnally
twelvefold
novennium
semi-daily
biphasic
quadranscentennial
two-time
constant
multiperiodic
bidaily

English words for 'Occurring once a duodecade, occurring every 12 years.'

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