single word requests - Is there a term to describe an event which happens every 18 months?


Obviously every year is annual. Every two years is biennial. Does the English language have a term for every 18 months?



Answer



sesquiennial



ocurring every year and a half.


Etymology: semi ("half") + que ("and")



I cannot find a dictionary definition of this other than Wiktionary, and 0 hits on Google NGram.


But there are some examples of usage here



FAME now has responsibility for the sesquiennial (every 18 months) Music Festivals which attract players from Europe, American continent



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