plural betas
1
: the 2nd letter of the Greek alphabet see Alphabet Table
2
: something or someone designated with the name beta or the Greek letter β especially denoting the second in position, order, or class
3
: a nearly complete prototype of a product (such as software)
the beta version
also
: a stage of development in which a product is nearly complete but not yet ready for release
The app is still in beta.
4
: beta particle
beta emissions
5
: a measure of the risk potential of a stock or an investment portfolio expressed as a ratio of the stock's or portfolio's volatility to the volatility of the market as a whole
Beta measures a stock's price volatility—or risk—compared with the market in general …—Marlys J. Harris
6
: beta wave
The findings could also help scientists better understand other beta-associated disorders, such as Parkinson's disease or obsessive compulsive disorder …—Brown University News Release (Providence, Rhode Island)
: second in position in the structure of an organic molecule from a particular group or atom
beta substitution
—often used in combination —symbol β
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Merriam-Webster unabridged
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