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. [1913 Webster]
"Being a layman, I ought not to have concerned myself with speculations which belong to the profession."
[1913 Webster]
A lay figure. See under Lay, n. (above). Dryden [1913 Webster]
layman, n. (pl. -men; fem. laywoman, pl. -women)
1 any non-ordained member of a Church.
2 a person without professional or specialized knowledge in a particular subject.