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."