What is the origin of 'sleep tight'?
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Definition of Ionism in US English:
Ionism
noun
Ionic nature, style, or character; a form or idiom characteristic of or restricted to the Ionic dialect.
Origin
Late 17th century; earliest use found in Elisha Coles. From post-classical Latin Ionismus from classical Latin Iōnes, plural noun + -ismus. Compare French ionisme.
