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  • zeta
    zeta
    noun
    the sixth letter of the Greek alphabet (Z, ζ).
  • ZETA
    ZETA
    noun
    a torus-shaped apparatus used for research in the 1950s and early 1960s on controlled thermonuclear reactions and plasma physics
  • Zeta
    Zeta
    noun
    (foll by the genitive case of a specified constellation) the sixth brightest star in a constellation

zeta

American  
[zey-tuh, zee-] / ˈzeɪ tə, ˈzi- /

noun

  1. the sixth letter of the Greek alphabet (Z, ζ).

  2. the consonant sound represented by this letter.


ZETA 1 British  
/ ˈziːtə /

noun

  1. a torus-shaped apparatus used for research in the 1950s and early 1960s on controlled thermonuclear reactions and plasma physics

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Zeta 2 British  
/ ˈziːtə /

noun

  1. (foll by the genitive case of a specified constellation) the sixth brightest star in a constellation

    Zeta Tauri

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

zeta 3 British  
/ ˈziːtə /

noun

  1. the sixth letter in the Greek alphabet (Ζ, ζ), a consonant, transliterated as z

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Usage

What else does zeta mean? Zeta is a letter of the Greek alphabet. As a letter, zeta is popularly encountered in the names of fraternities and sororities. Zeta is also popularly associated with a famous alien abduction story. In men’s rights lingo, zeta refers to a man who refuses to have their masculinity defined by or in terms of women. What are some other words related to zeta?alphaomegamanosphereincel

Etymology

Origin of zeta

First recorded in 1820–30, zeta is from the Greek word zêta

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Among these is the famous zeta ring, a very faint and dusty celestial object first discovered by the Voyager 2 satellite in 1986.

From Salon Dec. 19, 2023

“Spring training being closed in March would be worse for us than another covid outbreak, like if they announced the zeta variant was coming. It would be that bad.”

From Washington Post Feb. 23, 2022

Riemann found that the key to understanding their distribution lay within another set of numbers, the zeroes of a function called the Riemann zeta function that has both real and imaginary inputs.

From Science Magazine Sep. 24, 2018

As a physicist, I was aware that the zeros of the zeta function describe the distribution of the prime numbers.

From Nature Jul. 17, 2018

I have barely begun to study this zeta field, and this one may very well be unique—irreplaceable.

From Subspace Survivors by Dongen, H. R. van

The firm plans to list itself on the New York Stock Exchange under the ticker symbol "ZETA".

From Reuters Apr. 26, 2021

The research was funded by internal grants from Marian University and Sigma Zeta.

From Science Daily Apr. 2, 2026

Before the end of 2025, Ives added one more job: adviser to Zeta Global Holdings, a publicly traded marketing-tech company.

From Barron's Jan. 30, 2026

“The advisors serve in a nonfiduciary, non-governance capacity. The role of Zeta’s advisors is fundamentally different than the role of the company’s Board of Directors,” a Zeta spokeswoman said.

From Barron's Jan. 30, 2026

Zeta’s products compete with Salesforce, among other companies that Ives covers, but his position with Zeta isn’t disclosed in his social-media posts about Zeta or in related research reports.

From Barron's Jan. 30, 2026

Who wouldn’t want to be in a prime club like Kappa Zeta?

From "The Freedom Writers Diary" by The Freedom Writers

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