*SET-U

English word origin

Etymology of oath

From Middle English ooth, oth, ath, from Old English āþ (“oath”), from Proto-West Germanic *aiþ (“oath”), from Proto-Germanic *aiþaz (“oath”). Cognate with Scots aith, athe (“oath”), North Frisian ith, iss (“oath”), Sate

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 solemn pledge or promise that invokes a deity, a ruler, or another entity (not necessarily present) to attest the truth of a statement or sincerity of one's desire to fulfill a contract or promise. · A statement or promise which is strengthened (affirmed) by such a pledge. · A light, irreverent or insulting appeal to a deity or other entity. · A curse, a curse word.

verb

To pledge.

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

From Middle English ooth, oth, ath, from Old English āþ (“oath”), from Proto-West Germanic *aiþ (“oath”), from Proto-Germanic *aiþaz (“oath”). Cognate with Scots aith, athe (“oath”), North Frisian ith, iss (“oath”), Saterland Frisian Eed (“oath”), West Frisian eed (“oath”), Dutch eed (“oath”), German Eid (“oath”), Swedish ed (“oath”), Icelandic eið (“oath”), Latin ūtor (“make use of, employ, avail”, verb), Old Irish óeth (“oath”).

Relationships mentioned by the source

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

  • Inherited-form mentionoothenm
  • Inherited-form mentionāþang
  • Inherited-form mention*aiþgmw-pro
  • Inherited-form mention*aiþazgem-pro
  • Cognate mentionaithsco
  • Cognate mentionithfrr
  • Cognate mentionEedstq · oath
  • Cognate mentioneedfy · oath
  • Cognate mentioneednl · oath
  • Cognate mentionEidde · oath
  • Cognate mentionedsv · oath
  • Cognate mentioneiðis · oath
  • Cognate mentionūtorla · make use of, employ, avail
  • Cognate mentionóethsga · oath
Inspect preserved source fields

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

{
  "templates": [
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "enm",
        "3": "ooth"
      },
      "expansion": "Middle English ooth"
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "ang",
        "3": "āþ",
        "4": "",
        "5": "oath"
      },
      "expansion": "Old English āþ (“oath”)"
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "gmw-pro",
        "3": "*aiþ",
        "4": "",
        "5": "oath"
      },
      "expansion": "Proto-West Germanic *aiþ (“oath”)"
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "gem-pro",
        "3": "*aiþaz",
        "4": "",
        "5": "oath"
      },
      "expansion": "Proto-Germanic *aiþaz (“oath”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "sco",
        "2": "aith"
      },
      "expansion": "Scots aith"
    },
    {
      "name": "cog",
      "args": {
        "1": "frr",
        "2": "ith"
      },
      "expansion": "North Frisian ith"
    },
    {
      "name": "cog",
      "args": {
        "1": "stq",
        "2": "Eed",
        "t": "oath"
      },
      "expansion": "Saterland Frisian Eed (“oath”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "fy",
        "2": "eed",
        "t": "oath"
      },
      "expansion": "West Frisian eed (“oath”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "nl",
        "2": "eed",
        "t": "oath"
      },
      "expansion": "Dutch eed (“oath”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "de",
        "2": "Eid",
        "t": "oath"
      },
      "expansion": "German Eid (“oath”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "sv",
        "2": "ed",
        "t": "oath"
      },
      "expansion": "Swedish ed (“oath”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "is",
        "2": "eið",
        "t": "oath"
      },
      "expansion": "Icelandic eið (“oath”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "la",
        "2": "ūtor",
        "t": "make use of, employ, avail",
        "pos": "verb"
      },
      "expansion": "Latin ūtor (“make use of, employ, avail”, verb)"
    },
    {
      "name": "cog",
      "args": {
        "1": "sga",
        "2": "óeth",
        "t": "oath"
      },
      "expansion": "Old Irish óeth (“oath”)"
    }
  ],
  "links": [
    [
      "ooth",
      "ooth#Middle_English"
    ],
    [
      "oth",
      "oth#Middle_English"
    ],
    [
      "ath",
      "ath#Middle_English"
    ],
    [
      "āþ",
      "aþ#Old_English"
    ],
    [
      "*aiþ",
      "Reconstruction:Proto-West Germanic/aiþ"
    ],
    [
      "*aiþaz",
      "Reconstruction:Proto-Germanic/aiþaz"
    ],
    [
      "aith",
      "aith#Scots"
    ],
    [
      "athe",
      "athe#Scots"
    ],
    [
      "ith",
      "ith#North_Frisian"
    ],
    [
      "iss",
      "iss#North_Frisian"
    ],
    [
      "Eed",
      "Eed#Saterland_Frisian"
    ],
    [
      "eed",
      "eed#West_Frisian"
    ],
    [
      "eed",
      "eed#Dutch"
    ],
    [
      "Eid",
      "Eid#German"
    ],
    [
      "ed",
      "ed#Swedish"
    ],
    [
      "eið",
      "eið#Icelandic"
    ],
    [
      "ūtor",
      "utor#Latin"
    ],
    [
      "óeth",
      "óeth#Old_Irish"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "noun",
      "glosses": [
        "A solemn pledge or promise that invokes a deity, a ruler, or another entity (not necessarily present) to attest the truth of a statement or sincerity of one's desire to fulfill a contract or promise.",
        "A statement or promise which is strengthened (affirmed) by such a pledge.",
        "A light, irreverent or insulting appeal to a deity or other entity.",
        "A curse, a curse word."
      ],
      "tags": [],
      "recordId": "96dd983ff34f1e47465c5715435fe5c6849cbe3e89e2eb8553665d0b877a4730",
      "rawRecordSha256": "1e68e79a7bcf3f9f3d7a54b3ece8794cb9337e0339b0595c845df89b7e262a28",
      "sourceRecordOrdinal": 180941
    },
    {
      "pos": "verb",
      "glosses": [
        "To pledge."
      ],
      "tags": [
        "archaic"
      ],
      "recordId": "e6e4e2d3a66ecb220e9e41ba0337bf8b9d86eac1d42f2a2c5cf99bb395414f8c",
      "rawRecordSha256": "fef78e8607de19cba0554b1f0267115f2924d979110bbf9a794728e93ef26073",
      "sourceRecordOrdinal": 180942
    }
  ],
  "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 oath →

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-b2F0aA