tonite

colloquial shortening of tonight, attested by 1918.

Present-day student notices on bulletin boards, etc., read oftener than not, "Party Friday Nite," "Meeting Tonite," "Kum Tonite," etc. [Louise Pound, Spelling-Manipulation and Present-Day Advertising, "Dialect Notes," 1923]
Online Etymology Dictionary, © 2010 Douglas Harper

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