say it: KAL-uhn-dur
calendar is a noun and verb meaning "a system of timekeeping that defines the beginning and length and divisions of the year". It carries 4 recorded senses.
a system of timekeeping that defines the beginning and length and divisions of the year
a tabular array of the days (usually for one year)
enter into a calendar
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for calendar come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.