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day

/deɪ/

A 24-hour period or daylight interval

From Proto-Germanic, ultimately disputed Proto-Indo-European origin day (Daylight).

noun
verb
day
Proto-Indo-European (proposed)
Verified
*dhegh- “to burn”
reconstructed
A leading etymological theory connects daytime with burning or heat; the origin is disputed.

from PIE root *dhegh- "to burn" (see fever ). Not considered to be related to Latin dies (which is

Proto-Germanic
Verified
*dages- / *dagaz
reconstructed
“Day”; ancestor of German Tag, Dutch dag, Old Norse dagr, and Gothic dags.

from Proto-Germanic *dages- "day" (source also of Old Saxon, Middle Dutch, Dutch dag , Old Frisian di, dei , Old High...

+1 more source
Old English
Verified
dæġ
Originally the period when the sun was above the horizon, and later a lifetime or defined period.

from Old English dæġ

Middle English to Modern English
Verified
day
The meaning expanded to include the complete 24-hour cycle, not merely daylight.

from Middle English day

Modern English
day

For early English speakers, a day was initially not the neat 24-hour package shown on a modern calendar; it meant the bright stretch when the sun was above the horizon. Only in late Anglo-Saxon times did it broaden into the full cycle of light and darkness. The word probably traveled through Proto-Germanic *dagaz, but scholars still argue about its deepest ancestor: one theory links it to Proto-Indo-European *dhegh-, “to burn,” while another proposes *agh-, “a day.” So English day is not considered a cousin of Latin dies, despite their suspiciously similar appearances; dies comes from a different root associated with shining. Its family does produce a delightful botanical surprise: Old English dæges eage, “day’s eye,” became daisy because the flower opens at dawn and shuts at dusk. A daisy is therefore, in miniature, a little eye that keeps time with the sun.

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