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."