- IPA[pərˈpeCH(əw)əl ˈkaləndər]
- a calendar that can be adjusted to show any combination of day, month, and year, and is therefore usable year after year.；a set of tables from which the day of the week can be reckoned for any date.
noun: perpetual calendar, plural noun: perpetual calendars
- n.a calendar in which the day, the month, and the date are adjusted independently to show any combination of the three.
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