perpetual calendar definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- a calendar mathematically arranged so that the correct day of the week can be determined for any given date over a wide range of years
- a desk calendar adjustable for each of many years
perpetual calendar definition by American Heritage Dictionary
A chart or mechanical device that indicates the day of the week corresponding to any given date over a period of many years.