An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1) General: The beginning or starting point.
2) Math.: The point of intersection of two or more axes.

M.E., from L. origin-, origo "beginning, source, lineage," from oriri "to rise," cognate with Pers. ras-, rasidan "to arrive;" O.Pers./Av. rasa- present stem of ar- to move, go or come forward;" cf. Skt. ar- "to reach, come toward, meet with," rccháti reaches;" Gk. erkhomai "to go, to reach."

Xâstgâh, from xâst past stem of xâstan, xizidan "to rise, get up" (Mid.Pers. xyz- "to stand up, rise;" Proto-Iranian *xiz- "to rise, ascend; increase") + -gâh suffix of time and place (Mid.Pers. gâh, gâs "time;" O.Pers. gāθu-; Av. gātav-, gātu- "place, throne, spot;" cf. Skt. gâtu- "going, motion; free space for moving; place of abode;" PIE *gwem- "to go, come").