Calendar

Did you ever think of a calendar as something noisy? Does your calendar shout at you? Perhaps the events on your calendar are calling out for your attention!
 
The word calendar has its origins in the Proto-Indo-European (PIE) root kele(2) (to shout). PIE  kele(2) is the source of many ancient words; for example, Sanskrit usakala (the rooster’s dawn calling), Old Irish cailech (rooster), Greek kalein (to call) and kelados (noise), Old English hlowan (to low, to make a noise like a cow—does your calendar ‘mooove’ you?), and Latin calare (to announce solemnly) and clamare (to cry out).
 
The word calendar (the year divided systematically into days and months), first seen in English around 1200, comes from Old French calendier (list, register) and Latin calendarium (account book) and Latin calendae (the calends; i.e., the first day of the Roman month when debts were due and accounts were reckoned)—perhaps Benjamin Franklin was thinking of this when he coined the phrase ‘time is money’!
 
Latin calare (to announce solemnly, to call out) refers to proclamations from the priests of the temples announcing the new moon and the first day of a new month—the calends (imagine someone walking down your street proclaiming, “It’s the first day of the month!! Pay your debts!”).
 
And, lest we forget, the word calendar is not to be confused with the word calender (a cloth-presser)!
 
The word calendar is related to words such as acclaim, clairvoyance, clamor, clarify, class, clear, conciliate, council, declare, éclair, exclaim, proclaim, reconcile, and many others.
 
Reference: Online Etymological Dictionary, https://www.etymonline.com/
​