vicennial
sesquiannual
quadranscentennial
biennial
biyearly
vigesimal
sesquiennial
semi-weekly
semiannual
bicentennial
biannual
duodecade
quadrennial
running
Adar Sheni
Veadar
semimonthly
bimonthly
tricennial
biannually
semiannually
semperannual
multidaily
enneatical
monthly
half-yearly
bidaily
bimestrial
annual
yearly
repeating
semestral
quasiperiodic
semestrial
punctual
trieterical
constant
centennially
severally
oft-repeated
periodic
twentyfold
periodical
isochronal
triennial
sextennial
semi-daily
every time one turns around
accrued
accumulated
harmonic
mensal
recurrence
century
repetitively
triannually
ever
recurrent
secular
vicennium
perennial
nineteenfold
repeated
episodic
cycle
over and over
vigentennial
again and again
over and over again
time and time again
heterochronic
constantly
time and again
reiteratedly
biweekly
oft
often
eighteenfold
frequently
persistent
ofttimes
infrequent
oftentimes

English words for 'occurring once every 20 years'

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