Definition of "Buy" :
noun: an advantageous purchase
"The stock was a real buy at that price."
verb: accept as true
"I can't buy this story."
verb: obtain by purchase; acquire by means of a financial transaction
"She buys for the big department store."
verb: acquire by trade or sacrifice or exchange
"She wanted to buy his love with her dedication to him and his work."
verb: make illegal payments to in exchange for favors or influence
verb: be worth or be capable of buying
"This sum will buy you a ride on the train."