Merriam-Webster Collegiate Dictionary - fellow

 noun  Usage: often attributive  Etymology: Middle English felawe, from Old English feolaga, from Old Norse felagi, from felag partnership, from fe cattle, money + lag act of laying  Date: before 12th century  1. comrade, associate  2.  a. an equal in rank, power, or character ; peer  b. one of a pair ; mate  3. a member of a group having common characteristics; specifically a member of an incorporated literary or scientific society  4.  a. obsolete a person of one of the lower social classes  b. archaic a worthless man or boy  c. man, boy  d. boyfriend, beau  5. an incorporated member of a college or collegiate foundation especially in a British university  6. a person appointed to a position granting a stipend and allowing for advanced study or research