be·ta

/ˈbeıtə, Brit ˈbiːtə/ noun

1 [singular] : the second letter of the Greek alphabet — Β or β

2 [noncount] : a version of a product (such as a computer program) that is almost finished and that is used for testing

a program that is currently in beta

— often used before another noun

the beta version of the software

a beta test

beta testing