Pass·o·ver (psvr) n. Judaism A holiday beginning on the 14th of Nisan and traditionally continuing for eight days, commemorating the exodus of the Hebrews from Egypt. Also called Pesach. [Translation of Hebrew pesa.] Source: The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2000 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.