The sixth letter of the modern Greek alphabet (Ζ (Z), ζ (z)) preceded by epsilon (Ε (E), ε (e)) and followed by eta, (Η (I), η (i)); or the seventh letter in the ancient Greek alphabet, in which it is preceded by digamma (Ϝ (W), ϝ (w))

(historical) medieval state roughly equivalent to modern Montenegro.

A member of Los Zetas, a Mexican criminal syndicate.

(physics) Acronym of zero-energy thermonuclear assembly/apparatus (a torus-shaped reactor used in the mid-20th century to carry out experiments in plasma physics and temperature-controlled thermonuclear reactions)

plural of zeta

plural of Zeta

A star in the constellation Gemini.

(mathematics) function of the complex variable s that analytically continues the sum of the infinite series ∑ₙ₌₁ ᪲1/(nˢ) that converges when the real part of s is greater than 1.

plural of zeta function

(mathematics) The value of a particular zeta function