degree; grade; level; step; graduation
“El agua suele hervir a cien grados centígrados.” — Water usually boils at 100 degrees Celsius.
Inherited from Old Spanish grado (“staircase; rank, dignity”), inherited from Latin gradus (“a step, pace; step of a staircase; degree”), derived from Proto-Indo-European *gʰredʰ- (“to walk, go”). The retention of the -d- is due to the invalidity of the -ao hiatus in Old Spanish that would result from dropping it, compare the retention of -d- and -g- in vado, espárrago, agosto, llaga. Portuguese grau. Doublet of grao.