beta Syllabification: (be·ta)Pronunciation: /ˈbātə/Definition of beta noun the second letter of the Greek alphabet (Β, β), transliterated as ‘b.’. [as modifier] denoting the second of a series of items, categories, forms of a chemical compound, etc.:beta carotene beta blocker informalshort for beta test.their database system is currently in beta [as modifier]:a beta version (Beta) [followed by Latin genitive] the second (usually second-brightest) star in a constellation:Beta Virginis [as modifier] relating to beta decay or beta particles:beta emittersbeta in other Oxford dictionaries Definition of beta in the British & World English dictionary
