*SET-U

English word origin

Etymology of duo-

PIE word *dwóh₁ Etymology tree Proto-Indo-European *dwóh₁ Proto-Italic *duō Latin duo English duo- From Latin duo (“two”).

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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

two

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

PIE word *dwóh₁ Etymology tree Proto-Indo-European *dwóh₁ Proto-Italic *duō Latin duo English duo- From Latin duo (“two”).

Relationships mentioned by the source

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

  • Unspecified derivation mentionduola
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": "etymon",
      "args": {
        "1": "en",
        "2": ":uder",
        "3": "la:duo",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *dwóh₁\nProto-Italic *duō\nLatin duo\nEnglish duo-\n[Appendix:Glossary#inherited|Inherited]] from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Proto-Italic\", \"term\" : \"*duō\", \"status\" : \"ok\", \"lang\" : \"itc-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Latin\", \"term\" : \"duo\", \"status\" : \"ok\", \"lang\" : \"la\" } ], \"keyword_label\" : \"From\", \"keyword\" : \"uder\" } ], \"lang_name\" : \"English\", \"term\" : \"duo-\", \"status\" : \"ok\", \"lang\" : \"en\" }\" data-lang=\"en\" data-title=\"duo-\">"
    },
    {
      "name": "uder",
      "args": {
        "1": "en",
        "2": "la",
        "3": "duo",
        "4": "",
        "5": "two"
      },
      "expansion": "Latin duo (“two”)"
    },
    {
      "name": "etymon",
      "args": {
        "1": "en",
        "2": ":uder",
        "3": "la:duo",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *dwóh₁\nProto-Italic *duō\nLatin duo\nEnglish duo-"
    }
  ],
  "links": [
    [
      "*dwóh₁",
      "Reconstruction:Proto-Indo-European/dwóh₁"
    ],
    [
      "*dwóh₁",
      "Reconstruction:Proto-Indo-European/dwóh₁"
    ],
    [
      "*duō",
      "Reconstruction:Proto-Italic/duō"
    ],
    [
      "duo",
      "duo#Latin"
    ],
    [
      "duo",
      "duo#Latin"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "prefix",
      "glosses": [
        "two"
      ],
      "tags": [
        "morpheme"
      ],
      "recordId": "33917922bca719d988f8ba470fc486e5d17b429f9762e9dc8dd2e19a04d6eed6",
      "rawRecordSha256": "1faa29dbf3c806c8be1c137b83bcfc7bbc4775dca4827b4f2bd04cbcf728a0ab",
      "sourceRecordOrdinal": 182529
    }
  ],
  "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 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-ZHVvLQ