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 (bā′tə, bē′-)
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. Astronomy The second brightest star in a constellation.
5. Computers The version of a software or hardware product used in a beta test.
1. Being the second-ranked individual of one's sex. Used of social animals: the beta male of the chimpanzee colony.
2. Chemistry
a. Being in the second position relative to a designated carbon atom in an organic molecule at which an atom or a group may be substituted.
b. Referring to the second of a group of isomers, or molecules of similar origin or properties, determined arbitrarily by those who discover or classify them. Used in combination: beta-estradiol
3. Computers Of or relating to a beta test or the software or hardware involved in a beta test.

[Greek bēta, of Phoenician origin; see byt in Semitic roots.]


1. (Letters of the Alphabet (Foreign)) the second letter in the Greek alphabet (Β, β), a consonant, transliterated as b
2. the second highest grade or mark, as in an examination
3. (General Physics) (modifier)
a. involving or relating to electrons: beta emitter.
b. relating to one of two or more allotropes or crystal structures of a solid: beta iron.
c. relating to one of two or more isomeric forms of a chemical compound
[from Greek bēta, from Hebrew; see beth]


(Astronomy) (foll by the genitive case of a specified constellation) a star in a constellation, usually the second brightest: Beta Persei.


(ˈbeɪ tə; esp. Brit. ˈbi-)

n., pl. -tas,
adj. n.
1. the second letter of the Greek alphabet (Β, ß).
2. (cap.) the second brightest star in a constellation: Beta Tauri.
3. the second of any series.
a. pertaining to one of the possible positions of an atom or group in a compound.
b. pertaining to one of two or more isomeric compounds.
[< Latin < Greek bêta < Semitic; compare Hebrew bēth]


(ˈbeɪ tə; esp. Brit. ˈbi-) Trademark.
a videocassette tape format.


A test period for new software or hardware.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.beta - the 2nd letter of the Greek alphabet
Greek alphabet - the alphabet used by ancient Greeks
alphabetic character, letter of the alphabet, letter - the conventional characters of the alphabet used to represent speech; "his grandmother taught him his letters"
2.beta - beetsBeta - beets          
caryophylloid dicot genus - genus of relatively early dicotyledonous plants including mostly flowers
beet, Beta vulgaris, common beet - biennial Eurasian plant usually having a swollen edible root; widely cultivated as a food crop
Adj.1.beta - second in order of importance; "the candidate, considered a beta male, was perceived to be unable to lead his party to victory"
important, of import - of great significance or value; "important people"; "the important questions of the day"
2.beta - preliminary or testing stage of a software or hardware productbeta - preliminary or testing stage of a software or hardware product; "a beta version"; "beta software"
explorative, exploratory - serving in or intended for exploration or discovery; "an exploratory operation"; "exploratory reconnaissance"; "digging an exploratory well in the Gulf of Mexico"; "exploratory talks between diplomats"


A. Nbeta f
B. CPD beta blocker N (Med) → betabloqueador m


nBeta nt; (Brit Sch) → gut


n beta; — blocker beta-bloqueador m, beta-bloqueante m; — carotene betacaroteno; beta-hemolytic beta-hemolítico
References in classic literature ?
He caricatured the practice in the very form of his diction, as in the verse: '{Epsilon pi iota chi alpha rho eta nu / epsilon iota delta omicron nu / Mu alpha rho alpha theta omega nu alpha delta epsilon / Beta alpha delta iota zeta omicron nu tau alpha}, or, {omicron upsilon kappa / alpha nu / gamma / epsilon rho alpha mu epsilon nu omicron sigma / tau omicron nu / epsilon kappa epsilon iota nu omicron upsilon /epsilon lambda lambda epsilon beta omicron rho omicron nu}.
Or, for {eta iota omicron nu epsilon sigma / beta omicron omicron omega rho iota nu, eta iota omicron nu epsilon sigma kappa rho alpha zeta omicron upsilon rho iota nu}
Standing at the beginning of British (and English) history, his name came to be applied to the whole of it, just as the first two Greek letters, alpha and beta, have given the name to the alphabet.
2 betas update existing emojis by enhancing them with more details for a more realistic look.
The study by Weinraub and Kuhlman (1994) was the first to examine the effect of the variability of individual stock betas on the variability of small portfolio betas.
Emily DuVal of the University of California, Berkeley finds a similar scenario among lance-tailed manakins, but speculates that the betas reap another benefit.
com/apple-rolls-out-third-macos-sierra-10121-public-beta-testers-ahead-official-release-2426507) latest macOS Sierra betas .
FilePlanet is a premier destination for passionate video gamers to download game betas, demos, trials and user-created mods, with 25 million registered users, and a growing library of over 300,000 game files.
announced today the initiation of the first-ever study designed to examine how the implementation of regularly scheduled interferon beta (IFN-(beta)) neutralizing antibody (NAb) tests in multiple sclerosis (MS) patients receiving high-dose IFN-(beta) therapy ultimately affects treatment patterns, versus the usual care of IFN-(beta) patients.
Beta Systems Software AG (Prime Standard: BSS on the German stock exchange), a supplier of high-performance solutions for mass data management, today announced the availability of Harbor Enterprise NSM (Network Storage Manager) 7.
1 beta to&nbsp;developers, Apple is now pleased to roll out the third beta build for the upcoming update to public beta testers.