The only free and comprehensive online etymological dictionary of the Spanish language
grado (2) m. (Noun) "wish," "preference"
12th cent. From Latin gratus "pleasing." From Proto-Italic *gwrāto- 'id.' From Proto-Indo-European *gwr̥H-to- "praised (in a song)." From *gwerH- "to praise."
Indo-European
Romance
Portuguese grado, Catalan grat, French gré, Italian grado
Italic
Oscan brateis "mercy," Vestinian brat 'id.,' Paelignian brat 'id.'
Indo-Iranian
Sanskrit gūrtí- "song of praise"
grado (3) m. (Noun) "grade"
12th cent. From Latin gradus "step," in the sense of steps forming degrees of quality or proximity. For a further etymology see grado (1).
Indo-European
Romance
Portuguese grado, Catalan grau, French grade, Italian grado, Romanian grad
grafia f. (Noun) "orthographic symbol"
20th cent. From Greek γρᾰ́φειν (gráphein) "to write." From Proto-Indo-European *gerbh- "to scratch."
Indo-European
Germanic
Old High German kerben "to carve," Old English ceorfan 'id.' (English to carve)
Balto-Slavic
Old Church Slavonic žrěbii "allotment," Russian žérebej "cut off piece"
grafo m. (Noun) "graph"
Borrowed from Ancient Greek γράφος (gráphos) "drawing," "writing," from the verb γρᾰ́φειν (gráphein) "to write" (see grafia).
grafo-, -grafo (Prefix, Suffix) "writer;" "writing"
Borrowed from Ancient Greek -γραφω (-grapho) "writing," from the verb γρᾰ́φειν (gráphein) "to write" (see grafia).
grande (1) (Adjective) "great," "large"
11th cent. From Latin grandis 'id.' Of unknown origin.
Indo-European
Romance
Asturian grande, Portuguese grande, Galician grande, Catalan gran, French grand, Italian grande, Sardinian grande
grande (2) (Noun) "nobility," "magnate"
A metaphorical extension of grande (1).
Also the origin of the surnames Grande and Grandes.
Grande de España "highest noble." Said of those who enjoyed the greatest privileges of the realm before the king and queen.
grandioso (Adjective) "grandiose"
Very early 17th cent. From grande and -oso, an adjective-forming suffix.
gratis (Adjective, Adverb) "free," "freely"
Early 17th cent. Borrowed from Latin gratis 'id.,' earlier gratiis "by grace," "by friendship;" ablative of gratia "grace" (see gracia).
Indo-European
Romance
Portuguese grátis, Catalan gratis, French gratis, Italian gratis, Romanian gratis
On the evolution of gratis, consider the parallel remarks of Benveniste on its development from Latin into French: "Lat. gratiosus can mean “who feels gratitude” and “held in favor, popular” and also “what shows favor, gracious.” With the same specialization, gratiis contracted to gratis, which French has borrowed from Latin, means “without paying”: gratis habitare ‘to live for nothing, without paying rent’. In this way there appears in the use of gratia a new sense, that of a service provided or obtained “by grace and favor, to give pleasure.”" ~ E. Benveniste, Indo-European Language and Society (1973)
grave (Adjective) "heavy," "serious"
10th cent. Old Spanish grave "heavy," "serious," "difficult." The meaning of "difficult" was eventually replaced in Old Spanish by difícil. From Latin gravis 'id.' From Proto-Italic *grawus 'id.' From Proto-Indo-European *gwreh2-u̯s 'id.' From the root *gwreh2- "to be heavy."
Indo-European
Romance
Portuguese grave, Catalan greu, French grave, Italian grave, Aromanian greu, Romanian grev
Italic
Oscan bravús
Germanic
Gothic *kaurus
Hellenic
Hellenic Ancient Greek βαρύς (barys) "heavy" (whence bajo)
Indo-Iranian
Sanskrit gurú-
Tocharian
A krāmärts, B krāmär "weight"