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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The sixth letter of the Greek alphabet. See Table at alphabet.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The name of the sixth letter of the modern Greek alphabet (Ζ, ζ) preceded by epsilon (Ε, ε) and followed by eta, (Η, η); or the seventh letter in the ancient Greek alphabet, in which it is preceded by digamma (Ϝ, ϝ)
  • n. A mathematical function formally known as the Riemann zeta function.

from the GNU version of the Collaborative International Dictionary of English

  • n. A Greek letter [ζ] corresponding to our z.

from The Century Dictionary and Cyclopedia

  • n. The sixth letter of the Greek alphabet, corresponding to the English Z.
  • n. Zu + Zv − Z (u + v) = ksn u. sn verb sn (u + v).
  • n. A little closet or chamber: applied by some writers to the room over the porch of a Christian church where the porter or sexton lived and kept the church documents.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the 6th letter of the Greek alphabet


Greek zēta, of Phoenician origin; see zyn in Semitic roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From the Ancient Greek ζῆτα (zēta). (Wiktionary)



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  • "3. Zu + Zv − Z (u + v) = ksn u. sn verb sn (u + v)."
    --Cent. Dict.

    September 6, 2011

  • also an old nation in (roughly) present-day Montenegro.

    May 4, 2009