Definition of gamma in English:


Line breaks: gamma
Pronunciation: /ˈgamə


  • 1The third letter of the Greek alphabet (Γ, γ), transliterated as ‘g’.
    • The combinations γγ, γκ, and γχ are usually transliterated as ‘ng’, ‘nk’, and ‘nkh’ or ‘nch’
    More example sentences
    • In the Greek alphabet, each letter has a name that is not directly related to its sound value (alpha, beta, gamma, etc.), but this practice is not common in Roman derived alphabets.
    • His professional affiliations include Alpha Zeta, Gamma Sigma Delta, Phi Delta Kappa, and Phi Kappa Phi.
    • She works with the homeless through her participation in Delta Kappa Gamma and is involved with the Make a Wish Foundation.
  • 1.1 [as modifier] Denoting the third in a series of items, categories, etc.: the alpha, beta, gamma system of share classification
    More example sentences
    • Even a seemingly tiny piece of radioisotope like plutonium can be emitting many millions of alpha, beta or gamma particles per week.
    • All of this suggests that it would be more helpful to redirect theoretical attention to the interplay between alpha (= ‘evenness’), beta, and gamma diversity.
    • If one demarcates alpha, beta, and gamma world cities as three meaningful tiers, the alpha tier includes the usual urban triumvirate (London, New York, and Tokyo) but also Paris.
  • 1.2British A third-class mark given for an essay or other piece of work.
    More example sentences
    • I was very close to a First, but got a gamma double-minus in "Political Institutions".
  • 1.3 (Gamma) [followed by Latin genitive] Astronomy The third (usually third-brightest) star in a constellation: Gamma Orionis
    More example sentences
    • His first observation was made on 3rd December 1725, and he saw the star - Gamma Draconis - in his telescope as he expected.
    • In 1725 Bradley systematically observed the star Gamma Draconis and noticed a seasonal shift in the star's position on the sky.
    • It is also known as the Amazon Star, the warrioress, or Gamma Orionis.
  • 2 [as modifier] Relating to gamma rays: gamma detector
    More example sentences
    • The nuclear portal monitor and Palm Pilot neutron and gamma detector are designed to detect and identify the illicit movement of nuclear materials.
    • Three complementary instruments make up GRS: the gamma subsystem, the high-energy neutron detector, and the neutron spectrometer.
    • By measuring the relative velocity of backscattered gamma particles, they reveal the chemical environment of Fe nuclei in the rock.
  • 3 Physics (plural same) A unit of magnetic field strength equal to 10−5 oersted.
    More example sentences
    • At very small velocities, gamma is approximately equal to one.
    • Mass m in the equation E = mc is equal to the rest mass times the factor gamma.
    • It might also find that, within the experiment's limits of precision, gamma is equal to one - just as Einstein predicted.


via Latin from Greek.

More definitions of gamma

Definition of gamma in: