From Proto-Indo-Iranian *HrtaHwan-, from Proto-Indo-European *h₂rteh₂-wen-, possesive derivation of *h₂rtós (“fitted”), whence also ऋत (ṛta, “order; right, etc.”). Cognates include Old Persian [script?] (artava, “righteous, blessed, characterized by R̥ta”) and Avestan 𐬀𐬴𐬀𐬬𐬀𐬥 (aṣ̌avan-, “follower of Aṣ̌a”).
- keeping within the fixed order or rule, regular, proper (as inanimated objects)
- performing (as men) or accepting (as gods) sacred works or piety, truthful, faithful, just, holy