SCHEDULE, originally a written strip or leaf of paper or parchment, a label or ticket, especially when attached to another document, as explaining or adding to its contents, hence any additional detailed statement such as cannot conveniently be embodied in the main statement. The word occurs first (14th century) as cedule, or sedule, representing the Fr. cedule (mod. cedule, cf. Ital. cedola, Ger. Zeltel, etc.), which is derived from Late Lat. scedula or schedula, dim. of sceda, a written strip of parchment (late Gr. ffx&?)> probably from scindere, to cleave, cf . scindda, a shingle. The original pronunciation in English was sedule, the modern pronunciation is shedule; American usage has gone back to the original Latin or Greek, and adopts skedule.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)