eta
/'i:tə/
Học thuậtThân thiện
Definition
- Noun:
- The seventh letter of the Greek alphabet (Η, η): "eta" is the name for the seventh letter in the Greek alphabet, equivalent to the long 'e' sound in English.
- A Basque separatist organization: "ETA" is an acronym for Euskadi Ta Askatasuna (Basque Homeland and Liberty), a former armed group that sought independence for the Basque Country from Spain and France.
Usage Examples
- Noun (Greek letter):
- In physics, the symbol η (eta) often represents efficiency.
- The word 'encyclopedia' derives from Greek, using the letters epsilon, nu, kappa, upsilon, lambda, omicron, pi, epsilon, delta, iota, alpha, which includes an eta in its original form.
- Noun (Organization):
- ETA declared a permanent ceasefire in 2011.
- The Spanish government engaged in negotiations to dissolve ETA.
Advanced Usage
- In scientific notation: The lowercase eta (η) is commonly used as a symbol in various scientific fields.
- In fluid dynamics, η represents dynamic viscosity.
- In particle physics, the eta meson is a type of subatomic particle.
Variants and Related Words
- Eta Prime (η'): A specific meson in particle physics.
- Eta Squared (η²): A measure of effect size in statistics.
Synonyms
- Greek Letter: There is no direct synonym for the letter name "eta."
- Organization: separatist group, armed organization, nationalist group.
Related Phrases
- ETA as an abbreviation: In common English usage outside of the Basque context, "ETA" is a widely used initialism for "Estimated Time of Arrival."
- Note: This is a distinct, separate abbreviation and not a meaning of the standalone word "eta."
Noun
- the 7th letter of the Greek alphabet
- a terrorist organization organized in 1959 by student activists who were dissatisfied with the moderate nationalism of the traditional Basque party; want to create an independent homeland in Spain's western Pyrenees
- in 1968 ETA launched a campaign of political assassinations of government officials