Dæg (tācen: d) is gemet tīde þe stent on 24 tīda. Hē nis SI gemet ac is gebrocen mid SI.[1] Þæt SI gemet is þæt pricincel.
Þæt ƿord getācnaþ ge þā leohtes tīde þōnne sēo sunne is ofer þǣre ēaggemearce, þe þone fullan dæg, mid þǣre lēohtan tīde and þǣre deorcan tīde.