beta

Từ điển American Heritage Dictionary 4th

be·ta (bāʹtə, bēʹ-)n.
1. The second letter of the Greek alphabet. See table at alphabet.
2. The second item in a series or system of classification.
3. 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.
4. Physics.
a. A beta particle.
b. A beta ray.
5. Chemistry.
a. The second position from a designated carbon atom in an organic molecule at which an atom or a radical may be substituted.
b. An isomeric variation of a chemical compound. Used in combination:
beta-estradiol.
6. Computer Science. A beta version. [Greek bēta, of Phoenician origin. See byt in Semitic Roots.]

• Từ đồng nghĩa / Synonyms:
  Beta, genus Beta