button

(noun) a round fastener sewn to shirts and coats etc to fit through buttonholes.

(noun) an electrical switch operated by pressing. Synonyms: push button, push. Examples: "The elevator was operated by push buttons." "The push beside the bed operated a buzzer at the desk."

(noun) any of various plant parts that resemble buttons.

(noun) a round flat badge displaying information and suitable for pinning onto a garment. Examples: "They passed out campaign buttons for their candidate."

(noun) a female sexual organ homologous to the penis. Synonyms: clitoris, clit.

(noun) a device that when pressed will release part of a mechanism. Synonyms: release.

(noun) any artifact that resembles a button.

(verb) provide with buttons. Examples: "Button a shirt."

(verb) fasten with buttons. Examples: "Button the dress."