Source : Webster's Revised Unabridged Dictionary (1913)

Layman \Lay"man\n.; pl. {Laymen}. [Lay, adj. + man.]
   1. One of the people, in distinction from the clergy; one of
      the laity; sometimes, a man not belonging to some
      particular profession, in distinction from those who do.

Source : WordNet®

layman
     n : someone who is not a clergyman or a professional person
         [syn: {layperson}] [ant: {clergyman}]