An Etymological Dictionary of Astronomy and Astrophysics

1. To join together in a → federation.
   
2. To organize on a → federal basis.

Etymology (EN): From L. foederatus “leagued together, allied,” p.p. of foederare “to establish by treaty,” from foedus
“league, treaty, alliance,” related to fides “faith.”

Etymology (PE): Hiyâvidan, from Tabari hiyâ “together, with each other,” probably related to Av. hi- “to chain, bind,” hiθav- “association, assemblage,”
hinav- “bond, chain,” hita- “fastened;”
O.P. vištāspa- literally “with unbound horses;” Av. hitāspa-; Pers. gošudan “to open,” → resolve; cf. Skt. sā-/say- “to bind, fasten, fetter.” Coined on the model of Ger. Bund “federation, alliance, band,” cognate with Pers. bastan “to bind,” → absolute.