/ ˈleɪmən; NAmE / noun ( pl. -men / -mən; NAmE /) (also lay·per·son )
1.
a person who does not have expert knowledge of a particular subject :
a book written for professionals and laymen alike
to explain sth in layman's terms (= in simple language)
2.
a person who is a member of a Church but is not a priest or member of the clergy
—see also laywoman