calendar

nouns

a system of timekeeping that defines the beginning and length and divisions of the year
calendar
is derived from
calendric
is a type of (narrower)
an organized structure for arranging or classifying
"he changed the arrangement of the topics"; "the facts were familiar but it was in the organization of them that he was original"; "he tried to understand their system of classification"
arrangement, organisation, organization, system
a list or register of events (appointments or social events or court cases etc)
"I have you on my calendar for next Monday"
calendar
is a type of (narrower)
a database containing an ordered array of items (names or topics)
list, listing
a tabular array of the days (usually for one year)
calendar
is derived from
calendric
is a type of (narrower)
a set of data arranged in rows and columns
"see table 1"
table, tabular array

verbs

enter into a calendar
calendar
is a type of (narrower)
plan for an activity or event
"I've scheduled a concert next week"
schedule