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English word origin

Etymology of xi

From Ancient Greek ξεῖ (xeî), ξῖ (xî).

1 source sectionBrief source recordWiktionary original ↗
In this entry · 1 source sections

The source etymologies

Wiktionary via Kaikki / Wiktextract

The source reports below are imported and unreviewed by *SET-U. Separate numbered origins and differing source variants are preserved; agreement within this extraction is not independent corroboration.

Unnumbered source etymology

Original entry ↗
noun

The 14th letter of Classical and Modern Greek. The 15th in Ancient and Old Greek. · Either of a pair of hyperons having spin 1/2, which decay into a lambda particle and a pion.

Selected source glosses provide context, not a complete modern definition inventory

From Ancient Greek ξεῖ (xeî), ξῖ (xî).

Relationships mentioned by the source

These are extracted mentions, not a timeline or a verified sequence of immediate parents.

  • Unspecified derivation mentionξεῖgrc
Inspect preserved source fields

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

{
  "templates": [
    {
      "name": "uder",
      "args": {
        "1": "en",
        "2": "grc",
        "3": "ξεῖ"
      },
      "expansion": "Ancient Greek ξεῖ (xeî)"
    }
  ],
  "links": [
    [
      "ξεῖ",
      "ξεῖ#Ancient_Greek"
    ],
    [
      "ξῖ",
      "ξῖ#Ancient_Greek"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "noun",
      "glosses": [
        "The 14th letter of Classical and Modern Greek. The 15th in Ancient and Old Greek.",
        "Either of a pair of hyperons having spin 1/2, which decay into a lambda particle and a pion."
      ],
      "tags": [
        "particle"
      ],
      "recordId": "d8f86ad738ac7500162c903830cb510282331421c4ab994ee43e74102d9356c7",
      "rawRecordSha256": "20df36742f6bef8e10009c53154a71c2d3d5bf5dc9a371c6c0b21cda65b1e5b6",
      "sourceRecordOrdinal": 128400
    }
  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
    "links": 0,
    "references": 0,
    "descendants": 0,
    "lexicalRecords": 0,
    "lexicalSenses": 0,
    "glosses": 0
  }
}

Where this record stops

This page does not supply an independently verified sound-change sequence, first-use manuscript or complete family tree unless a cited analysis explicitly establishes one. Missing detail here is a limit of this record—not a claim that humanity knows nothing more.

An older meaning does not determine what a word must mean today. Follow the sources, preserve disagreements, and keep ancestry separate from interpretation.

Contribute located evidence for xi →

Source and snapshot

Imported from Wiktionary contributors; extracted by Tatu Ylonen / Wiktextract / Kaikki.org. Selected fields are reformatted and grouped; wording, source identity and etymology sections are retained. CC-BY-SA-4.0 applies to the imported source material.

Dump: 2026-10-01 · Extracted: 2026-10-30. These are snapshot dates, not the word’s first attestation or the page’s revision date.

Source entry and bibliography ↗Wiktionary revision history ↗Acquisition and rights ledger
Machine-source provenance
Source SHA-256
5ff2c072f8099f2d2ce484bd6957bf179f046d2ad37bc36555edf8bb84cb5291
Import run
73216b9a9b78ed3830994bf853103716f5a4dc57099e371e9f8fdc468facca26
Permanent entry ID
w-eGk