noun / adjective
beta
BAY-tuh/ˈbeɪtə/
The second letter of the Greek alphabet.
The second tile displays beta between alpha and gamma.

Etymology
Greek beta names the second letter, and its name is also used to designate second items in sequences. The software sense applies this sequencing label to a test version before final release.
In context
copilot for all these apps is being tested in beta and Microsoft has not committed to a final release date
More examples
- Beta is the second letter of the Greek alphabet.
- The student writes lowercase beta beneath the capital letter.
- The inscription places beta between alpha and gamma.
Forms
beta · betas