Pronunciation: [sˈɛskwi] (IPA) 
The word "sesqui" is uniquely spelled and often unfamiliar to many people. Its pronunciation is ses-kwee, with the first syllable sounding like "sess" and the second syllable like "kwee." The IPA transcription of this word is /ˈsɛskwi/. It is derived from the Latin word "sesquī" meaning "one and a half." The word is commonly used in the English language as a prefix to mean "one and a half times" or "a year and a half."
Sesqui is a prefix derived from the Latin word "sesqui," meaning "one and a half." It is commonly used in English to indicate a ratio of one and a half times, or in relation to an increase or augmentation by one and a half. It is primarily used in technical or scientific terms, referring to various measurements, proportions, or periods.
In terms of measurements, sesqui is often used to denote an increase of one and a half times the usual amount or size. For instance, "sesquicentennial" refers to a 150th anniversary, "sesquicarbonate" is a compound with one and a half times the amount of carbonates, and "sesquiterpene" denotes a class of organic compounds with a hydrocarbon chain containing one and a half times the usual number of carbon atoms.
When it comes to proportions, sesqui indicates a ratio of one and a half parts. For example, "sesquioxides" represent compounds that contain one metal atom combined with one and a half oxygen atoms. In the context of time, sesqui is used to describe a period of one and a half times the regular duration. It can be observed in "sesquicentennial" anniversaries or "sesquicentennial" celebrations that occur after 150 years, or in "sesquicentennial eclipses," which are solar eclipses that have a duration of roughly one and a half times the average length.
Overall, sesqui is a versatile prefix used to convey the concept of one and a half, whether it is related to measurements, proportions, or time periods.
The word "sesqui" comes from Latin, specifically from the compound of "semis" meaning "half" and "que" meaning "and". In Latin, "sesqui" means "one and a half" or "half again as much". The term is often used in various scientific and mathematical contexts to indicate a ratio of 1.5 or to express the relationship between two quantities.
