An Etymological Dictionary of Astronomy and Astrophysics

1. A helpful act by somebody for somebody else as a job, duty, or favor.
   

2. A system or organization supplying some public demand, e.g. transportation, telephone, health.
   

3. A facility providing maintenance and repair.

Etymology (EN): M.E., from O.Fr. servise, from L. servitium “slavery, servitude,” from servus “slave,” servire “to serve,” originally “be a slave;”
cognate with Av. har- “to guard, watch,” → server.

Etymology (PE): Zâvari “service” (Dehxodâ) → server.