Source : Webster's Revised Unabridged Dictionary (1913)

Commonly \Com"mon*ly\, adv.
   1. Usually; generally; ordinarily; frequently; for the most
      part; as, confirmed habits commonly continue through life.

   2. In common; familiarly. [Obs.] --Spenser.

Source : WordNet®

commonly
     adv : under normal conditions; "usually she was late" [syn: {normally},
            {usually}, {unremarkably}, {ordinarily}] [ant: {unusually}]