beta /ˈbiːtə/

b

I. noun

1. the second letter of the Greek alphabet ( Β, β), transliterated as ‘b’.
2. [as modifier] denoting the second of a series of items, categories, forms of a chemical compound, etc.

beta carotene
beta blocker.
3.
(Brit.) a second-class mark given for a piece of work or an examination paper.
4.
‹informal› short for beta test.
5. ( Beta) [followed by Latin genitive]
[Astronomy] the second (typically second-brightest) star in a constellation

Beta Virginis.
6. [as modifier] relating to beta decay or beta particles

beta emitters.
7. (also beta coefficient) a measure of the movement in price of a security relative to the stock market as a whole, used to indicate possible risk.

a fund with a beta of 0.58 is less volatile.
– origin via Latin from Greek.

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