*SET-U

English word origin

Etymology of onus

Etymology tree Proto-Indo-European *h₃en(H)- Proto-Indo-European *-os Proto-Indo-European *h₃én(H)os Proto-Italic *onos Latin onuslbor. English onus Learned borrowing from Latin onus (literally “burden”).

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

A legal obligation. · Burden of proof, onus probandi. · Stigma. · Blame.

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

Etymology tree Proto-Indo-European *h₃en(H)- Proto-Indo-European *-os Proto-Indo-European *h₃én(H)os Proto-Italic *onos Latin onuslbor. English onus Learned borrowing from Latin onus (literally “burden”).

Relationships mentioned by the source

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

  • Learned-borrowing mentiononusla

This page abbreviates 1 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.

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    {
      "name": "etymon",
      "args": {
        "1": "en",
        "2": ":lbor",
        "3": "la:onus<id:burden>",
        "id": "burden",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *h₃en(H)-\nProto-Indo-European *-os\nProto-Indo-European *h₃én(H)os\nProto-Italic *onos\nLatin onuslbor.\nEnglish onus\n[Appendix:Glossary#learned_borrowing|Learned borrowing]] from\", \"terms\" : [ { \"id\" : \"burden\", \"children\" : [ { \"terms\" : [ { \"id\" : \"burden\", \"children\" : [ { \"terms\" : [ { \"id\" : \"burden\", \"children\" : [ { \"terms\" : [ { \"children\" : [ ], \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*h₃en(H)-\", \"status\" : \"ok\", \"lang\" : \"ine-pro\" }, { \"id\" : \"athematic\", \"children\" : [ ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*-os\", \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"From\", \"is_group\" : true, \"keyword\" : \"affix\" } ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*h₃én(H)os\", \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Italic\", \"term\" : \"*onos\", \"lang\" : \"itc-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Latin\", \"term\" : \"onus\", \"lang\" : \"la\" } ], \"keyword\" : \"lbor\" } ], \"status\" : \"ok\", \"lang_name\" : \"English\", \"term\" : \"onus\", \"lang\" : \"en\" }\" data-id=\"burden\" data-lang=\"en\" data-title=\"onus\" id=\"English:_burden\">"
    },
    {
      "name": "lbor",
      "args": {
        "1": "en",
        "2": "la",
        "3": "onus",
        "lit": "burden"
      },
      "expansion": "Learned borrowing from Latin onus (literally “burden”)"
    },
    {
      "name": "etymon",
      "args": {
        "1": "en",
        "2": ":lbor",
        "3": "la:onus<id:burden>",
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      },
      "expansion": "Etymology tree\nProto-Indo-European *h₃en(H)-\nProto-Indo-European *-os\nProto-Indo-European *h₃én(H)os\nProto-Italic *onos\nLatin onuslbor.\nEnglish onus"
    }
  ],
  "links": [
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      "*h₃en(H)-",
      "Reconstruction:Proto-Indo-European/h₃en(H)-"
    ],
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      "*-os",
      "Reconstruction:Proto-Indo-European/-os#Proto-Indo-European:_athematic"
    ],
    [
      "*h₃én(H)os",
      "Reconstruction:Proto-Indo-European/h₃én(H)os#Proto-Indo-European:_burden"
    ],
    [
      "*onos",
      "Reconstruction:Proto-Italic/onos#Proto-Italic:_burden"
    ],
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      "onus",
      "onus#Latin:_burden"
    ],
    [
      "onus",
      "onus#Latin"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "noun",
      "glosses": [
        "A legal obligation.",
        "Burden of proof, onus probandi.",
        "Stigma.",
        "Blame."
      ],
      "tags": [
        "countable",
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}

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 onus →

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-b251cw