Definition of "Button" :

noun: a round fastener sewn to shirts and coats etc to fit through buttonholes

noun: any artifact that resembles a button

noun: an electrical switch operated by pressing

"The elevator was operated by push buttons."

noun: a device that when pressed will release part of a mechanism

noun: a female sexual organ homologous to the penis

noun: a round flat badge displaying information and suitable for pinning onto a garment

"They passed out campaign buttons for their candidate."

noun: any of various plant parts that resemble buttons

verb: fasten with buttons

"Button the dress."

verb: provide with buttons

"Button a shirt."