köken: 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…
aile: de grado en grado, en sumo grado, grado Celsius, grado centígrado, grado cero, grado de asociado, título de grado