enneatical
biquarterly
weekly
multidaily
decennial
semi-weekly
sextennial
Adar Sheni
Veadar
severally
octennial
oft-repeated
octan
sevenfold
decarepeat
bidaily
every so often
biweekly
habitually
semiweekly
hebdomadal
punctual
manifold
hebdomadary
septan
running
sequent
repeated
sesquiannual
perennial
time and again
recurrent
time and time again
over and over again
over and over
heterochronic
vicennial
stated
semi-daily
twice-weekly
recurrence
repeating
roll around
come around
continually
time after time
triannually
undecennary
on a regular basis
harmonic
common
on the regular
periodic
undecennial
semestrial
semiperiodic
frequent
week in, week out
forever
repeatedly
tridaily
semestral
triweekly
QOD
many at times
annual
decamillennial
yearly
regular recurrence
rhythm
cyclical
cycle
septuple
recurringly
constantly
tenfold
quintan
thricely
again and again
every day
quasiperiodic
enneandrous
recursion
often
trimestrial
decennially
day in, day out
reiteratedly
semperannual
thick
enneatical
biquarterly
weekly
multidaily
decennial
semi-weekly
sextennial
octennial
oft-repeated
octan
bidaily
biweekly
semiweekly
hebdomadal
punctual
hebdomadary
septan
running
sequent
repeated
sesquiannual
perennial
recurrent
heterochronic
vicennial
stated
semi-daily
twice-weekly
repeating
undecennary
harmonic
common
periodic
undecennial
semestrial
semiperiodic
frequent
tridaily
semestral
triweekly
annual
decamillennial
yearly
cyclical
septuple
tenfold
quintan
quasiperiodic
enneandrous
trimestrial
semperannual
severally
sevenfold
every so often
habitually
manifold
time and again
time and time again
over and over again
over and over
continually
time after time
triannually
on the regular
week in, week out
forever
repeatedly
tridaily
QOD
many at times
recurringly
constantly
weekly
thricely
again and again
every day
often
decennially
day in, day out
reiteratedly
thick
Adar Sheni
Veadar
decarepeat
recurrence
regular recurrence
rhythm
cycle
recursion
roll around
come around
English words for 'Occurring once in every nine times, days, years, etc.; every ninth.'
As you may have noticed, above you will find words for "Occurring once in every nine times, days, years, etc.; every ninth.". Hover the mouse over the word you'd like to know more about to view its definition. Click 
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