An Etymological Dictionary of Astronomy and Astrophysics

1. (v. intr.) To turn aside, as from a way, course, etc. By extension, to depart from a course of action or acceptable norm.
   

2. (v.tr.) To cause to turn aside. → deviation, → standard deviation.

Etymology (EN): From L.L. deviatus “turned from the straight road,” p.p. of deviare, from → de- + via “road,” + -ate.

Etymology (PE): 1) Kažraftan, from kaž “crooked, bent, being aside” (cf. Skt. kubja- “hump-backed, crooked,” Pali kujja- “bent,” L. gibbus “hump, hunch,” Lith. kupra “hump”) +
raftan “to go, walk, proceed” (present tense stem row-, Mid.Pers. raftan, raw-, Proto-Iranian *rab/f- “to go; to attack”).

2. Kažrâh kardan, from kaž, as above, + râh “way, path” (Mid.Pers. râh, râs “way, street,” from *rāθa-, cf. Av. ratha- “chariot,” akin to Skt. rathah “car, chariot,” L. rota “wheel,” rotare “revolve, roll,” Lith. ratas “wheel,” O.H.G. rad, Ger. Rad, Du. rad, O.Ir. roth; PIE *roto- “to run, to turn, to roll”) + kardan “to do, to make,” Mid.Pers. kardan, O.Pers./Av. kar- “to do, make, build,” Av. kərənaoiti “makes,” cf. Skt. kr- “to do, to make,” krnoti “makes,” karma “act, deed;” PIE base k^wer- “to do, to make.”