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sesquiannual. In DICTIOUS you will not only get to know all the dictionary meanings for the word
sesquiannual, but we will also tell you about its etymology, its characteristics and you will know how to say
sesquiannual in singular and plural. Everything you need to know about the word
sesquiannual you have here. The definition of the word
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English
Etymology
From sesqui- + annual.
Adjective
sesquiannual (not comparable)
- 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)
2012, Information Retrieval Technology: 8th Asia Information Retrieval Societies Conference, edited by Yuexian Hou, Jian-Yun Nie, Le Sun, Bo Wang, and Peng Zhang, →ISBN, page 29: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.]
Usage notes
Conventionally, X-annual terms (like biannual) mean "X number of times a year" and so this term would be expected to mean "one and a half times a year, i.e. once every 8 months"; however, that sense is not attested; in use, this term is treated as a synonym of sesquiennial (“once every one and a half years”).