Meanings
- not comparableOccurring 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)
2 more examples
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.]
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
Origin
Cite this entry
sesquiannual. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/sesquiannual
“sesquiannual.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/sesquiannual. Accessed November 4, 2026.
WatkinsX Dictionary, s.v. “sesquiannual,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/sesquiannual.
Source: sesquiannual on Wiktionary, CC BY-SA 4.0.