*SET-U

English word origin

Etymology of duo

PIE word *dwóh₁ From French duo or Italian duo, from Latin duo (“two”), from Proto-Italic *duō, from Proto-Indo-European *dwóh₁. Doublet of two, which was inherited via Proto-Germanic.

1 source sectionExtended source reportWiktionary 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

Two people who work or collaborate together as partners; especially · Two musicians who perform music together. · Any pair of people. · Any cocktail consisting of a spirit and a liqueur.

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

PIE word *dwóh₁ From French duo or Italian duo, from Latin duo (“two”), from Proto-Italic *duō, from Proto-Indo-European *dwóh₁. Doublet of two, which was inherited via Proto-Germanic.

Relationships mentioned by the source

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

  • Borrowed-form mentionduofr
  • Borrowed-form mentionduoit
  • Derivation mentionduola · two
  • Derivation mention*duōitc-pro
  • Derivation mention*dwóh₁ine-pro
  • Doublet mentiontwoen

This page abbreviates 2 auxiliary source items. The etymology narrative is not shortened. Omission counts are available in the audit fields below; consult the original for complete auxiliary material.

Inspect preserved source fields

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

{
  "templates": [
    {
      "name": "dercat",
      "args": {
        "1": "en",
        "2": "ine-pro"
      },
      "expansion": ""
    },
    {
      "name": "langname",
      "args": {
        "1": "ine-pro"
      },
      "expansion": "Proto-Indo-European"
    },
    {
      "name": "word",
      "args": {
        "1": "en",
        "2": "ine",
        "3": "dwóh₁",
        "id": ""
      },
      "expansion": ""
    },
    {
      "name": "PIE word",
      "args": {
        "1": "en",
        "2": "dwóh₁"
      },
      "expansion": "PIE word\n *dwóh₁"
    },
    {
      "name": "bor",
      "args": {
        "1": "en",
        "2": "fr",
        "3": "duo"
      },
      "expansion": "French duo"
    },
    {
      "name": "bor",
      "args": {
        "1": "en",
        "2": "it",
        "3": "duo"
      },
      "expansion": "Italian duo"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "la",
        "3": "duo",
        "t": "two"
      },
      "expansion": "Latin duo (“two”)"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "itc-pro",
        "3": "*duō"
      },
      "expansion": "Proto-Italic *duō"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*dwóh₁"
      },
      "expansion": "Proto-Indo-European *dwóh₁"
    },
    {
      "name": "doublet",
      "args": {
        "1": "en",
        "2": "two"
      },
      "expansion": "Doublet of two"
    }
  ],
  "links": [
    [
      "*dwóh₁",
      "Reconstruction:Proto-Indo-European/dwóh₁"
    ],
    [
      "duo",
      "duo#French"
    ],
    [
      "duo",
      "duo#Italian"
    ],
    [
      "duo",
      "duo#Latin"
    ],
    [
      "*duō",
      "Reconstruction:Proto-Italic/duō"
    ],
    [
      "*dwóh₁",
      "Reconstruction:Proto-Indo-European/dwóh₁"
    ],
    [
      "two",
      "two#English"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "noun",
      "glosses": [
        "Two people who work or collaborate together as partners; especially",
        "Two musicians who perform music together.",
        "Any pair of people.",
        "Any cocktail consisting of a spirit and a liqueur."
      ],
      "tags": [],
      "recordId": "2832653ec30b09dcf23401c369981ad4e92b4c286267cffa2d270aeb9ab49c2c",
      "rawRecordSha256": "c9dfd0a7495961f5b684ef4d3232c08ee730a39faa222a30c75f4d2dc0012650",
      "sourceRecordOrdinal": 116864
    }
  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
    "links": 0,
    "references": 0,
    "descendants": 0,
    "lexicalRecords": 0,
    "lexicalSenses": 2,
    "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 duo →

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-ZHVv