Button

/ˈbətn/

 noun

1. a small disc or knob that is used to fasten a dress, pants, shirt, or other article of clothing
Don’t get me wrong, I love a good cardigan too, but a jacket— especially one with sharp shoulders, interesting buttons, or a unique collar— always looks the most fashion forward.
– Nina Garcia, (1965 – )

2. a knob on a piece of equipment that is pressed to operate it
A photograph is a moment when you press the button, it will never come back.
– Renee Berri, (1917-1998)

3. a hidden sensitivity that can be manipulated to produce a desired response
I didn’t mean to push all of your buttons, I was looking for mute.
– Author unknown

4. a usually circular metal or plastic badge bearing a stamped design or printed slogan

5. in computer interface systems, a well-defined area within the interface that is clicked to select a command
We live in a world where people can ridicule you at the push of a button. They can question you at the push of a button.
– Chadwick Boseman, (1976-2020)

verb

to secure with a button or snap
If the first button of one’s coat is wrongly buttoned, all the rest will be crooked.
– Johann Wolfgang Goethe, (1749-1832)