Da se malo pozabavimo etimologijom.
grade (n.) Look up grade at Dictionary.com
1510s, "degree of measurement," from French grade "grade, degree" (16c.), from Latin
gradus "step, pace, gait, walk; step on a ladder or stair;" figuratively "a step, stage, degree," from gradi (past participle gressus) "to walk, step, go,"
from PIE *ghredh-
"to walk, go" (cognates: Lithuanian gridiju "to go, wander," Old Church Slavonic gredo "to come," Old Irish in-greinn "he pursues," and second element in congress, progress, etc.). Replaced Middle English gree "step, degree in a series," from Old French grei "step," from Latin gradus.
http://www.etymonline.com/index.php?allowed_in_frame=0&search=grad
Etymology 2
FromProto-Slavic *gradъ, from
Proto-Indo-European*greh₃d-.
https://en.wiktionary.org/wiki/%D0%B3%D1%80%D0%B0%D0%B4
yard (n.1)
"patch of ground around a house," Old English geard "fenced enclosure, garden, court; residence, house," from Proto-Germanic *gardaz (cognates: Old Norse garðr "enclosure, garden, yard;" Old Frisian garda, Dutch gaard, Old High German garto, German Garten "garden;" Gothic gards "house," garda "stall"), from PIE *ghor-to-, suffixed form of root *gher- (1) "to grasp, enclose," with derivatives meaning "enclosure" (cognates: Old English gyrdan "to gird," Sanskrit ghra- "house," Albanian garth "hedge," Latin hortus "garden," Phrygian -gordum "town," Greek khortos "pasture," Old Irish gort "field," Breton garz "enclosure, garden," and second element in Latin cohors "enclosure, yard, company of soldiers, multitude").
Lithuanian gardas "pen, enclosure," Old Church Slavonic gradu "town, city," and Russian gorod, -grad "town, city" belong to this group, but linguists dispute whether they are independent developments or borrowings from Germanic. As "college campus enclosed by the main buildings," 1630s. Shipyard is from c. 1700. In railway usage, "ground adjacent to a train station or terminus, used for switching or coupling trains," 1827. Yard sale is attested by 1976.
http://www.etymonline.com/index.php?term=yard
Izgleda kako sve dolazi od glagola graditi.