- calendar
- c.1200, from O.Fr. calendier "list, register," from L. calendarium "account book," from kalendae "calends" the first day of the Roman month -- when debts fell due and accounts were reckoned -- from calare "to announce solemnly, call out," as the priests did in proclaiming the new moon that marked the calends, from PIE base kele- "to call, shout" (see claim). "Taken by the early Church for its register list of saints and their feast days. The -ar spelling in Eng. is 17c. to differentiate it from the now obscure calender "cloth-presser."