UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈbiːtə/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈbeɪtə/ ,USA pronunciation: respelling(bāor, esp. Brit.,-)

WordReference Random House Learner's Dictionary of American English © 2020
be•ta /ˈbeɪtə/USA pronunciation   n.[countable]pl.  -tas. 
  1. Linguisticsthe second letter of the Greek alphabet (B, &bgr;

WordReference Random House Unabridged Dictionary of American English © 2020
be•ta  (bāor, esp. Brit.,-),USA pronunciation n. 
  1. Linguisticsthe second letter of the Greek alphabet (β, B).
  2. Linguisticsthe consonant sound represented by this letter.
  3. (cap.) [Astron.]a star that is usually the second brightest of a constellation:The second brightest star in Taurus is Beta Tauri.
  4. Chemistry
    • one of the possible positions of an atom or group in a compound.
    • one of two or more isomeric compounds.
  5. Chemistry, Physicsthe second of any series, as in chemistry or physics.
  6. Stock Exchange, BusinessAlso called  beta coefficient, beta line. an arbitrary measure of the volatility of a given stock using an index of the volatility of the market as a whole:A beta of 1.1 indicates a stock that is 10 percent more volatile than the market.
  7. Radio and Television, Trademarks(cap.) [Trademark.]a brand of tape format for VCR tape, incompatible with other formats. Cf. VHS.
  8. British Terms, Education[Chiefly Brit.]a grade showing that a student is in the middle or second of three scholastic sections in a class. Cf. alpha (def. 7), gamma (def. 9).
  • Semitic; compare Hebrew bēth beth
  • Greek bêta
  • Latin

Collins Concise English Dictionary © HarperCollins Publishers::
beta /ˈbiːtə/ n
  1. 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
Etymology: from Greek bēta, from Hebrew; see beth
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