The second letter of the Greek alphabet, B, β. See B, and cf. etymology of Alphabet.
- The second letter of the Greek alphabet. See Table at alphabet.
- The second item in a series or system of classification.
- A mathematical measure of the sensitivity of rates of return on a portfolio or a given stock compared with rates of return on the market as a whole. A beta of 1.0 indicates that an asset closely follows the market; a beta greater than 1.0 indicates greater volatility than the market.
- Physics A beta particle.
- Physics A beta ray.
- Chemistry The second position from a designated carbon atom in an organic molecule at which an atom or a radical may be substituted.
- Chemistry An isomeric variation of a chemical compound. Used in combination: beta-estradiol.
- Computer Science A beta version.