tonite (adv.)

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]

explosive used in blasting, 1881, from Latin tonare "to thunder" (see thunder (n.)) + -ite (2).