Definition of "Lay" :
noun: a narrative poem of popular origin
noun: a narrative song with a recurrent refrain
verb: put into a certain place or abstract location
verb: put in a horizontal position
"Lay the books on the table."
verb: lay eggs
"This hen doesn't lay."
verb: prepare or position for action or operation
"Lay a fire."
verb: impose as a duty, burden, or punishment
"Lay a responsibility on someone."
adjective: not of or from a profession
"A lay opinion as to the cause of the disease."
adjective: characteristic of those who are not members of the clergy
"The lay ministry."