*SET-U

English word origin

Etymology of warn

From Middle English warnen, warnien (“to warn; admonish”), from Old English warnian (“to take heed; warn”), from Proto-Germanic *warnōną (“to warn; take heed”), from Proto-Indo-European *wer- (“to be aware; give heed”).

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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 ↗
verb

To make (someone) aware of impending danger, evil, etc. · To notify or inform (someone, about something). · To summon (someone) to or inform of a formal meeting or duty. · To make a sound (e.g. clicking or whirring) indicating that it is about to strike or chime (an hour).

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

From Middle English warnen, warnien (“to warn; admonish”), from Old English warnian (“to take heed; warn”), from Proto-Germanic *warnōną (“to warn; take heed”), from Proto-Indo-European *wer- (“to be aware; give heed”). Cognate with Dutch waarnen (obsolete), German Low German warnen, German warnen, Swedish varna, Icelandic varna.

Relationships mentioned by the source

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

This page abbreviates 3 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": "inh",
      "args": {
        "1": "en",
        "2": "enm",
        "3": "warnen"
      },
      "expansion": "Middle English warnen"
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "ang",
        "3": "warnian",
        "4": "",
        "5": "to take heed; warn"
      },
      "expansion": "Old English warnian (“to take heed; warn”)"
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "gem-pro",
        "3": "*warnōną",
        "4": "",
        "5": "to warn; take heed"
      },
      "expansion": "Proto-Germanic *warnōną (“to warn; take heed”)"
    },
    {
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        "4": "",
        "5": "to be aware; give heed"
      },
      "expansion": "Proto-Indo-European *wer- (“to be aware; give heed”)"
    },
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        "2": "waarnen"
      },
      "expansion": "Dutch waarnen"
    },
    {
      "name": "q",
      "args": {
        "1": "obsolete"
      },
      "expansion": "(obsolete)"
    },
    {
      "name": "cog",
      "args": {
        "1": "nds-de",
        "2": "warnen"
      },
      "expansion": "German Low German warnen"
    },
    {
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      "args": {
        "1": "de",
        "2": "warnen"
      },
      "expansion": "German warnen"
    },
    {
      "name": "cog",
      "args": {
        "1": "sv",
        "2": "varna"
      },
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    },
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      "name": "cog",
      "args": {
        "1": "is",
        "2": "varna"
      },
      "expansion": "Icelandic varna"
    }
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    ],
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      "warnien#Middle_English"
    ],
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      "warnian#Old_English"
    ],
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    ],
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      "*wer-",
      "Reconstruction:Proto-Indo-European/wer-"
    ],
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      "waarnen",
      "waarnen#Dutch"
    ],
    [
      "warnen",
      "warnen#Low_German"
    ],
    [
      "warnen",
      "warnen#German"
    ],
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      "varna#Swedish"
    ],
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      "varna",
      "varna#Icelandic"
    ]
  ],
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  "descendants": [],
  "lexical": [
    {
      "pos": "verb",
      "glosses": [
        "To make (someone) aware of impending danger, evil, etc.",
        "To notify or inform (someone, about something).",
        "To summon (someone) to or inform of a formal meeting or duty.",
        "To make a sound (e.g. clicking or whirring) indicating that it is about to strike or chime (an hour)."
      ],
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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 warn →

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-d2Fybg