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Related to sesqui-: Hepta
One and a half: sesquicentennial.
1. indicating one and a half: sesquicentennial.
2. (Chemistry) (in a chemical compound) indicating a ratio of two to three: sesquioxide.
[from Latin, contraction of semi- + as as2 + -que and]
a combining form meaning “one and a half”: sesquicentennial.