Definition of "beta"
beta
/ˈbiːtə/
noun
countable and uncountable, plural betas
(computing, video games)
(aviation) The range of engine power settings in which the blade pitch angle of a constant-speed propeller is controlled directly by the angle of the engine's throttle lever (rather than varying with engine torque and airspeed to maintain a constant propeller RPM), allowing the propeller to be disked to generate high drag and slow the aircraft quickly.
adjective
not comparable
(computing) Preliminary; prerelease. Refers to an incomplete version of a product released for initial testing.