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

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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