An Etymological Dictionary of Astronomy and Astrophysics

1. To make fast, firm, or stable.
   

2. To place definitely and more or less permanently (Dictionary.com).

Etymology (EN): M.E. fixen, probably from O.Fr. fixe “fixed,” from L. fixus “fixed, fast, established, settled,” p.p. of figere “to fix, fasten.”

Etymology (PE): Infinitive, from barjâ, → fixed.