Meaning of “button” in the English Dictionary

"button" in British English

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buttonnoun [ C ]

uk /ˈbʌt.ən/ us /ˈbʌt̬.ən/

buttonverb [ I or T ]

uk /ˈbʌt.ən/ us /ˈbʌt̬.ən/

(Definition of “button” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"button" in American English

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buttonnoun [ C ]

us /ˈbʌt·ən/

button noun [ C ] (CLOTHING FASTENER)

a small, usually circular object that is sewn on a shirt, coat, or other piece of clothing, and is used to fasten it

A button is also a small, usually circular sign that you can pin on your clothes:

When you pay the admission fee at the museum, they give you a button to wear to show you’ve paid.

button noun [ C ] (OBJECT YOU PRESS)

a small object that you press to operate a device or a machine:

The button on the left starts the tape recorder and the one on the right stops it.

buttonverb [ T ]

/ˈbʌt·ən/

button verb [ T ] (FASTEN)

to fasten something, usually a piece of clothing, using buttons:

He buttoned his shirt.

(Definition of “button” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"button" in Business English

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buttonnoun [ C ]

uk /ˈbʌtən/ us

COMMUNICATIONS, IT a small, often circular object which you press to operate a device or a machine, or an area on a computer screen which looks and works like one of these:

press/hit/push a button Press the green button to start the machine and the red button to stop it.
the send/save/delete button Always re-read your email messages carefully before you hit the send button.

MARKETING →  button ad

(Definition of “button” from the Cambridge Business English Dictionary © Cambridge University Press)