An Etymological Dictionary of Astronomy and Astrophysics

1. To found, institute, build, or bring into being on a firm or stable basis.
   

2. To show to be valid or true; prove.

Etymology (EN): From O.Fr. establiss-, stem of establir, from L. stabilire “make stable,” from stabilis “firm, stable,”
literally “able to stand,” from stare “to stand;” PIE base *sta- “to stand”
(cf. Mod.Pers. istâdan “to stand;” O.Pers./Av. sta- “to stand, stand still; set;” Skt. sthâ- “to stand;” Gk. histemi “put, place, weigh;” stasis “a standing still;” Lith. statau “place;” Goth. standan; O.E. standan “to stand,” stede “place”).

Etymology (PE): Nešâxtan, nešâzidan “to establish; to fix in the ground, strengthen,” from ne- “down, below,” → ni-, + šâxtan, šâz-, variants of Mod./Mid.Pers. sâxtan, sâz- “to form, prepare, build, make,” ultimately
from Proto-Iranian *sac- “to fit, be suitable; to prepare.”