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English word origin

Etymology of kilo-

Borrowed from French kilo-, irregularly derived from Ancient Greek χίλιοι (khílioi, “one thousand”). The etymologically "correct" form would be chili- or chilo-, resulting in forms such as chiliasme (“chiliasm”) or chilo

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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 ↗
prefix

In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by a thousand (1000). · Synonym of kibi- (“multiplying the unit to which it is attached by 2¹⁰ = 1024”).

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

Borrowed from French kilo-, irregularly derived from Ancient Greek χίλιοι (khílioi, “one thousand”). The etymologically "correct" form would be chili- or chilo-, resulting in forms such as chiliasme (“chiliasm”) or chilopode (“centipede”); but the French, when creating the prefix, had to avoid a possible (standard) pronunciation of chi as /ʃi/, too close to the vulgar verb chier (“to shit”).

Relationships mentioned by the source

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

Inspect preserved source fields

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

{
  "templates": [
    {
      "name": "root",
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*ǵʰes-"
      },
      "expansion": ""
    },
    {
      "name": "bor+",
      "args": {
        "1": "en",
        "2": "fr",
        "3": "kilo-"
      },
      "expansion": "Borrowed from French kilo-"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "grc",
        "3": "χίλιοι",
        "4": "",
        "5": "one thousand"
      },
      "expansion": "Ancient Greek χίλιοι (khílioi, “one thousand”)"
    }
  ],
  "links": [
    [
      "kilo-",
      "kilo-#French"
    ],
    [
      "χίλιοι",
      "χίλιοι#Ancient_Greek"
    ],
    [
      "chili-",
      "chili-#French"
    ],
    [
      "chilo-",
      "chilo-#French"
    ],
    [
      "chiliasme",
      "chiliasme#French"
    ],
    [
      "chilopode",
      "chilopode#French"
    ],
    [
      "chier",
      "chier#French"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "prefix",
      "glosses": [
        "In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by a thousand (1000).",
        "Synonym of kibi- (“multiplying the unit to which it is attached by 2¹⁰ = 1024”)."
      ],
      "tags": [
        "morpheme",
        "proscribed"
      ],
      "recordId": "e94496dfb2ec805bda7ea0e54828bc03d2f1d0f3cdaddfa623a61393a095be8b",
      "rawRecordSha256": "5c74abe4d447528953f5fe85828574352a5aa21b7b2a646650c4b1fbeab4e905",
      "sourceRecordOrdinal": 178915
    }
  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
    "links": 0,
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    "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 kilo- →

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-a2lsby0