gamma
/'gæmə/
Học thuậtThân thiện
Definition
- Noun:
- The third letter of the Greek alphabet (Γ, γ): This is the primary meaning, representing a character in the Greek writing system.
- A unit of magnetic field strength: In physics, a gamma is a very small unit of magnetic flux density, equal to one nanotesla (10⁻⁹ tesla) or, in the older CGS system, one hundred-thousandth of an oersted.
- A proper noun referring to a historical figure: Vasco da Gama, the Portuguese explorer. (Note: This is a capitalized proper name and not the common noun 'gamma').
Examples of Usage
- As the Greek letter:
- In mathematics, the gamma function (Γ) is a generalization of the factorial.
- The word 'grammar' starts with the Greek letter gamma.
- As a unit of measurement:
- The instrument detected a magnetic anomaly of 50 gamma.
- The Earth's magnetic field is measured in units like nanoteslas or gamma.
- As a proper noun (Vasco da Gama):
- Gamma was the first European to reach India by sea. (This usage refers specifically to the explorer.)
Advanced Usage
- Gamma radiation/rays: High-energy electromagnetic radiation emitted by atomic nuclei. This is a specific scientific term.
- Lead shielding is used to protect against gamma rays.
- Gamma correction: In imaging and computer graphics, a nonlinear operation used to encode and decode luminance or color values.
- Adjusting the gamma can make an image appear brighter or improve contrast.
Variants and Related Words
- Gamma minus (n): A grade or mark slightly below average or the standard.
- He received a gamma minus on his essay.
- Gamma plus (n): A grade or mark slightly above average or the standard.
- Her performance earned her a gamma plus.
- Gammation (n, rare/archaic): An ornament resembling the Greek letter gamma.
Synonyms
- For the Greek letter: None; it is a specific symbol.
- For the magnetic unit: nanotesla (in the SI system).
- For the explorer: Vasco da Gama (full name).
Related Phrases
- Gamma function (n): A specific mathematical function extending the factorial.
- Gamma distribution (n): A two-parameter family of continuous probability distributions.
- Gamma globulin (n): A class of proteins in blood plasma, including antibodies.
Related Idioms
- No common idioms use the word 'gamma' in isolation. It primarily appears in technical, scientific, or historical contexts.
Noun
- Portuguese navigator who led an expedition around the Cape of Good Hope in 1497; he sighted and named Natal on Christmas Day before crossing the Indian Ocean (1469-1524)
- a unit of magnetic field strength equal to one-hundred-thousandth of an oersted
- the 3rd letter of the Greek alphabet