American Heritage® Dictionary of the English Language, Fourth Edition
- n. A chart or mechanical device that indicates the day of the week corresponding to any given date over a period of many years.
GNU Webster's 1913
- adj. a calendar so devised that it may be adjusted for any month or year.
- A calendar that can be used perpetually or over a wide range of years. That of Capt. Herschel covers, as given below, dates from 1750 to 1961 only, but is capable of indefinite extension.
- n. a chart or mechanical device that indicates the days of the week corresponding to any given date over a long period of years
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