An Etymological Dictionary of Astronomy and Astrophysics

1. To attach firmly or securely in place; fix securely to something else.
   

2. To make secure, as an article of dress with buttons, clasps, etc., or a door with a lock, bolt, etc. (Dictionary.com).

Etymology (EN): From M.E. fastenen, from O.E. fæstnian; cognate with O.Fris. festnia “to make firm, bind fast,” O.Sax. fastnon, O.H.G. fastnion, O.N. fastna “to pledge, betroth.”

Etymology (PE): Darizidan, from Proto-Ir. *darz- “to attach, fasten;” cf. Av. darəz- “to attach;” Mid.Pers. handarz “advice, order, command,”
drz- “to fasten;” Mod.Pers. andarz “advice; testament,” darzan “needle,” darzi “tailor,” razé (with elimination of the initial phoneme) “a ring or staple used to fasten a door,” padarzé “a wrapper in which clothes are folded up;” cf. Skt. drah- “to fix, make firm;” Gk. drassomai “I take hold of, grasp;” Russ. deržat’ “to hold, keep” (Cheung 2007).