Source : Webster's Revised Unabridged Dictionary (1913)

Series \Se"ries\, n.
   1. (Bot.) In Engler's system of plant classification, a group
      of families showing certain structural or morphological
      relationships. It corresponds to the {cohort} of some
      writers, and to the {order} of many modern systematists.

   2. (Elec.) A mode of arranging the separate parts of a
      circuit by connecting them successively end to end to form
      a single path for the current; -- opposed to {parallel}.
      The parts so arranged are said to be

   {in series}.

   3. (Com.) A parcel of rough diamonds of assorted qualities.

Source : WordNet®

in series
     adj : of or relating to the sequential performance of multiple
           operations; "serial processing" [syn: {serial}, {in
           series(p)}, {nonparallel}]