What is "sesqui"

Sesqui, Latin for one-and-one-half times, may refer to:

• Sodium sesquicarbonate, a double salt of sodium bicarbonate and sodium carbonate
• Sesqui 1990, a 1990 festival in the city of Wellington, New Zealand
• Sesquicentennial Exposition, a 1926 world's fair hosted in Philadelphia
• Sesquilinear, a property of scalarproduct in complex spaces