Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
on-line [ˈɔnlaɪn] (COMPUT) adj неавтоно́мный; (switched on) подключе́нный
adv неавтоно́мно
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.