- noun a circle displayed beside an option on screen that, when selected, has a dark centre
- noun a circle displayed beside an option that, when selected, has a dark centre. Only one radio button can be selected at one time.
- One of multiple buttons presented on a computer display which allow for the selection of a given option. When a selection is made, all other possibilities are automatically excluded. This contrasts with a check box, where multiple choices may be selected together.
- noun a device on a computer screen that can be used to select an option from a list