sesquiannual
sesquiennial
bimestrial
trimestrial
semimonthly
vicennial
quadranscentennial
monthlyish
quarterly
biyearly
biennial
biannually
semiannually
half-monthly
bimonthly
mensal
semi-weekly
yearly
triennial
biannual
triannually
annual
half-yearly
trieterical
triweekly
tricennial
trimensual
monthly
biweekly
quadrennial
sextennial
thrice-monthly
trimonthly
twice-yearly
semestral
semestrial
multiyear
monthslong
fortnightly
bimensal
quotidian
interannual
semiweekly
twice-weekly
annually
semi-annually
semiannual
yearslong
triyearly
habitually
weeklyish
enneatical
month in, month out
terannual
tridaily
stated
dayslong
semidiurnally
Veadar
multidaily
bimensual
constantly
vigesimal
BID
Adar Sheni
weekly
quadannual
triennially
all the while

English words for 'Occurring once every one and a half years (i.e. once every 18 months).'

As you may have noticed, above you will find words for "Occurring once every one and a half years (i.e. once every 18 months).". Hover the mouse over the word you'd like to know more about to view its definition. Click search related words by phrase or description. to find a better fitting word. Finally, thanks to ChatGPT, the overall results have been greatly improved.

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