Where does “calendar year” come from?

calendar year (English) comes from English calendar, from Middle English kalender, from Old French calendier, from Latin calendārium, from Latin Calendae, from Latin calāre, from Latin chalāre, from Ancient Greek χαλάω — I slacken; I loosen; I become slack; I become...

calendar year (English): The length of time between the beginning and end of a year as marked on a calendar, such as from 0:00 January 1 to 24:00 December 31 in the Gregorian calendar

Definitions

  1. The length of time between the beginning and end of a year as marked on a calendar, such as from 0:00 January 1 to 24:00 December 31 in the Gregorian calendar

Ancestry of “calendar year”, step by step

calendar year traces back through two separate lines of ancestry.

via English calendar

StepLanguageWordMeaning
1EnglishcalendarAny system by which time is divided into days,...
2Middle EnglishkalenderA year; A calendar; An example to be followed or...
3Old Frenchcalendier
4Latincalendāriuman account book or debt book
5LatinCalendaeAbbreviation Cal; astronomical new moon; calends
6Latincalāre
7Latinchalāre
8Ancient GreekχαλάωI slacken; I loosen; I become slack; I become...

via English year

StepLanguageWordMeaning
1EnglishyearA solar year, the time it takes the Earth to...
2Middle Englishyeeryear
3Old Englishġēaryear
4Proto-West Germanicjāryear
5Proto-Germanicjērąyear; name of the J-rune
6Proto-Indo-Europeanyeh₁r-year
Every word from Ancient Greek χαλάωEvery word from Latin chalāreEvery word from Latin calāre