Etymology tree Proto-Indo-European *dʰegʷʰ-? Proto-Germanic *dagaz Proto-West Germanic *dag Old English dæġ Middle English day English day Inherited from Middle English day, from Old English dæġ, from Proto-West Germanic *dag, from Proto-Germanic *dagaz (“day”), from Proto-Indo-European *dʰegʷʰ- (“to burn”). Cognates Cognate with Scots day, dei, dey, dy (“day”), Yola daie, dei, dey, die (“day”), North Frisian dai, doi, däi (“day”), Saterland Frisian Dai (“day”), West Frisian dei (“day”), Bavarian Dåg, Tåg (“day”), Central Franconian Daach (“day”), Cimbrian tag, tage (“day”), Dutch dag, dagge (“day”), German Tag (“day”), German Low German Dag, Dagg (“day”), Limburgish Daach, Daag (“day”), Luxembourgish Dag (“day”), Mòcheno ta (“day”), Vilamovian taog (“day”), West Flemish dag (“day”), Yiddish טאָג (tog, “day”), Danish, Norwegian Bokmål, Norwegian Nynorsk, and Swedish dag (“day”), Faroese and Icelandic dagur (“day”), Norn dagh (“day”), Crimean Gothic tag (“day”), Gothic 𐌳𐌰𐌲𐍃 (dags, “day”), Vandalic *dag- (“day”); also Breton deviñ (“to burn”), Cornish dewi (“to kindle”), Irish daigh (“fire, flame”), dóigh (“to burn, singe; sear, scorch”), Manx daah (“to scorch, singe; to cauterize”), Scottish Gaelic dòth (“scorch, singe; burn”), Welsh deifio (“to scorch, singe”), Latin foveō (“to warm, keep warm”), Greek τέφρα (téfra, “ash, cinder”), Albanian dhez, ndez (“to kindle, light”), Old Prussian dagis (“summer”), Armenian հրդեհ (hrdeh, “fire”), Sanskrit दह् (dah, “to burn, consume by fire, scorch, roast”).

24-hour day • age • cycle • daylength • daylight • daytime • epoch • era • generation • Great Year • interval • mean solar day • nychthemeron • period • photoperiod • Platonic year • sidereal day • solar day • time • twenty-four hour day