Source : Webster's Revised Unabridged Dictionary (1913)

Fellow \Fel"low\, n. [OE. felawe, felaghe, Icel. f[=e]lagi, fr.
   f[=e]lag companionship, prop., a laying together of property;
   f[=e] property + lag a laying, pl. l["o]g law, akin to liggja
   to lie. See {Fee}, and {Law}, {Lie} to be low.]
   1. A companion; a comrade; an associate; a partner; a sharer.

            The fellows of his crime.             --Milton.

            We are fellows still, Serving alike in sorrow.
                                                  --Shak.

            That enormous engine was flanked by two fellows
            almost of equal magnitude.            --Gibbon.

   Note: Commonly used of men, but sometimes of women. --Judges
         xi. 37.

   2. A man without good breeding or worth; an ignoble or mean
      man.

            Worth makes the man, and want of it, the fellow.
                                                  --Pope.

   3. An equal in power, rank, character, etc.

            It is impossible that ever Rome Should breed thy
            fellow.                               --Shak.

   4. One of a pair, or of two things used together or suited to
      each other; a mate; the male.

            When they be but heifers of one year, . . . they are
            let go to the fellow and breed.       --Holland.

            This was my glove; here is the fellow of it. --Shak.

   5. A person; an individual.

            She seemed to be a good sort of fellow. --Dickens.

   6. In the English universities, a scholar who is appointed to
      a foundation called a fellowship, which gives a title to
      certain perquisites and privileges.

   7. In an American college or university, a member of the
      corporation which manages its business interests; also, a
      graduate appointed to a fellowship, who receives the
      income of the foundation.

   8. A member of a literary or scientific society; as, a Fellow
      of the Royal Society.

   Note: Fellow is often used in compound words, or adjectively,
         signifying associate, companion, or sometimes equal.
         Usually, such compounds or phrases are
         self-explanatory; as, fellow-citizen, or fellow
         citizen; fellow-student, or fellow student;
         fellow-workman, or fellow workman; fellow-mortal, or
         fellow mortal; fellow-sufferer; bedfellow; playfellow;
         workfellow.

               Were the great duke himself here, and would lift
               up My head to fellow pomp amongst his nobles.
                                                  --Ford.

Fellow \Fel"low\, v. t.
   To suit with; to pair with; to match. [Obs.] --Shak.

Source : WordNet®

fellow
     n 1: a boy or man; "that chap is your host"; "there's a fellow at
          the door"; "he's a likable cuss" [syn: {chap}, {feller},
           {lad}, {gent}, {fella}, {blighter}, {cuss}]
     2: a person who is frequently in the company of another;
        "drinking companions"; "comrades in arms" [syn: {companion},
         {comrade}, {familiar}, {associate}]
     3: a person who is member of your class or profession; "the
        surgeon consulted his colleagues"; "he sent e-mail to his
        fellow hackers" [syn: {colleague}, {confrere}]
     4: an informal form of address for a man; "Say, fellow, what
        are you doing?"; "Hey buster, what's up?" [syn: {buster}]
     5: a man who is the lover of a girl or young woman; "if I'd
        known he was her boyfriend I wouldn't have asked" [syn: {boyfriend},
         {beau}, {swain}, {young man}]