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Pronunciation varies by accent · adjective
Occurring once every one and a half years (i.e. once every 18 months)..
1979, R. E. Meyer, Sesquiannual Report – April 1977-September 1978, Fossil Energy Division/DOE (DOE/W-7405-eng–26-1; cited in Surface Phenomena in Enhanced Oil Recovery (2013, →ISBN, page 718)
1990, Sesquiannual Meeting of the American Society for Rickettsiology and Rickettsial Diseases; 8 (the society holds meetings roughly every 1.5 years, e.g. September 1989, May 1991, and September 1992)
NTCIR (NII Testbeds and Community for Information access Research) is a sesquiannual series of international evaluation workshops hosted by National Institute of Informatics (NII). [The 12th NTCIR conference was held 7-10 June 2016 and covered the period January 2015 - June 2016; the 11th conference was held one and a half years earlier 9-12 December 2014 and covered the period September 2013 - December 2014.]
Use sesquiannual when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Sesquiannual means Occurring once every one and a half years (i.e. once every 18 months)..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
1979, R. E. Meyer, Sesquiannual Report – April 1977-September 1978, Fossil Energy Division/DOE (DOE/W-7405-eng–26-1; cited in Surface Phenomena in Enhanced Oil Recovery (2013, →ISBN, page 718)
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