What is the X in X-mas?
"supplication, prayer," c.1300, verbal noun from beseech. Related: Beseechingly; beseechingness.
late 12c., bisecen "to beseech, beg urgently," from be- + Middle English secen "to seek" (see seek). German cognate besuchen is merely "to visit." Related: Besought; beseeching.