Source : Webster's Revised Unabridged Dictionary (1913)

Series \Se"ries\, n. [L. series, fr. serere, sertum, to join or
   bind together; cf. Gr. ??? to fasten, Skr. sarit thread. Cf.
   {Assert}, {Desert} a solitude, {Exert}, {Insert},
   {Seraglio}.]
   1. A number of things or events standing or succeeding in
      order, and connected by a like relation; sequence; order;
      course; a succession of things; as, a continuous series of
      calamitous events.

            During some years his life a series of triumphs.
                                                  --Macaulay.

   2. (Biol.) Any comprehensive group of animals or plants
      including several subordinate related groups.

   Note: Sometimes a series includes several classes; sometimes
         only orders or families; in other cases only species.

   3. (Math.) An indefinite number of terms succeeding one
      another, each of which is derived from one or more of the
      preceding by a fixed law, called the law of the series;
      as, an arithmetical series; a geometrical series.

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®

series
     n 1: similar things placed in order or happening one after
          another; "they were investigating a series of bank
          robberies"
     2: a serialized set of programs; "a comedy series"; "the
        Masterworks concert series" [syn: {serial}]
     3: a periodical that appears at scheduled times [syn: {serial},
         {serial publication}]
     4: (sports) several contests played successively by the same
        teams; "the visiting team swept the series"
     5: a group of postage stamps having a common theme or a group
        of coins or currency selected as a group for study or
        collection; "the Post Office issued a series commemorating
        famous American entertainers"; "his coin collection
        included the complete series of Indian-head pennies"
     6: (mathematics) the sum of a finite or infinite sequence of
        expressions
     7: (electronics) connection of components in such a manner that
        current flows first through one and then through the
        other; "the voltage divider consisted of a series of fixed
        resistors"