Nychthemeron

 ( Units Of Time ) 

Nychthemeron , occasionally nycthemeron or nuchthemeron, is a period of 24 consecutive . It is sometimes used, especially in technical literature, to avoid the ambiguity inherent in the term day.

It is the period of time that a calendar normally labels with a calendar date, although a nychthemeron simply designates a time-span that can start at any time, not just midnight.

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Etymology It is a loanword from Ancient Greek νυχθήμερον (nukhthḗmeron), which appears in the New Testament. This is a noun use of the neuter singular form of , from νύξ (núx, “night”) + ἡμέρα (hēméra, “day”).

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In other languages Some languages have a word for 24 hours, or more loosely a day plus a night in no particular order. Unlike a calendar date, only the length is defined, with no particular start or end. Furthermore, these words are considered basic and native to these languages, so unlike nychthemeron they are not associated with jargon.

Words for 24 hours are listed in the middle column. For comparison, the word for day, in the meaning of daytime, the sunlit state, the opposite of night, is also listed in the rightmost column:

dag

dag

dag

dag

dagur

dagur

dagr

däi

dei

dag

tago

päivä

päev

beaivi

diena

diena

dzień

день

יום

ден

দিন

दिन

பகல்

день

mchana

siang

昼

낮

ಹಗಲು

dydd

טאָג

დღე ("day")

The word dag, as in the Nordic languages, is Etymology cognate day in English.

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