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

English words for 'occurring once every 20 years'

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