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

1) A reason, fact, circumstance, or explanation that justifies or defends. What is offered as grounds for believing an assertion.
2) An act of justifying.

Verbal noun of → justify.

Râstâvard, from râst "right, true; just, upright, straight" (Mid.Pers. râst "true, straight, direct;" O.Pers. rāsta- "straight, true," rās- "to be right, straight, true;" Av. rāz- "to direct, put in line, set," razan- "order;" cf. Skt. raj- "to direct, stretch," rjuyant- "walking straight;" Gk. orektos "stretched out;" L. regere "to lead straight, guide, rule," p.p. rectus "right, straight;" Ger. recht; E. right; PIE base *reg- "move in a straight line," hence, "to direct, rule") + âvard past stem of âvardan "to bring; to adduce, bring forward in argument or as evidence" (Mid.Pers. âwurtan, âvaritan; Av. ābar- "to bring; to possess," from prefix ā- + Av./O.Pers. bar- "to bear, carry," bareθre "to bear (infinitive)," bareθri "a female that bears (children), a mother;" Mod.Pers. bordan "to carry;" Skt. bharati "he carries;" Gk. pherein; L. fero "to carry").