say it: BAY-tuh
beta is a noun and adjective meaning "the 2nd letter of the Greek alphabet". It carries 4 recorded senses.
the 2nd letter of the Greek alphabet
beets
second in order of importance
“the candidate, considered a beta male, was perceived to be unable to lead his party to victory”
preliminary or testing stage of a software or hardware product
“a beta version”
“beta software”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for beta come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.