*SET-U

English word origin

Etymology of alter

From Old French alterer (French altérer), from Medieval Latin alterāre (“to make other”), from Latin alter (“the other”), from al- (seen in alius (“other”), alienus (“of another”), etc.; see alias, alien, etc.) + compar.

2 source sectionsExtended source reportWiktionary original ↗
In this entry · 2 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.

Source etymology 1

Original entry ↗
verb

To change the form or structure of. · To become different. · To tailor clothes to make them fit. · To castrate, neuter or spay (a dog or other animal).

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

From Old French alterer (French altérer), from Medieval Latin alterāre (“to make other”), from Latin alter (“the other”), from al- (seen in alius (“other”), alienus (“of another”), etc.; see alias, alien, etc.) + compar. suffix -ter.

Relationships mentioned by the source

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

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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        "3": "*h₂el- (other)"
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      "args": {
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        "2": "altérer"
      },
      "expansion": "French altérer"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "la-med",
        "3": "alterō",
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        "alt": "alterāre"
      },
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    },
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        "3": "alter",
        "4": "",
        "5": "the other"
      },
      "expansion": "Latin alter (“the other”)"
    }
  ],
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    ],
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      "altero#Latin"
    ],
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      "alter",
      "alter#Latin"
    ],
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      "al-",
      "al-#Latin"
    ],
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      "alius",
      "alius#Latin"
    ],
    [
      "alienus",
      "alienus#Latin"
    ],
    [
      "alias",
      "alias"
    ],
    [
      "alien",
      "alien"
    ],
    [
      "-ter",
      "-ter#Latin"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
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      "pos": "verb",
      "glosses": [
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        "To become different.",
        "To tailor clothes to make them fit.",
        "To castrate, neuter or spay (a dog or other animal)."
      ],
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Source etymology 2

Original entry ↗
noun

One of the personalities, identities, or selves in a person with dissociative identity disorder or another form of multiplicity.

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

Probably from alter ego.

Inspect preserved source fields

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

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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 alter →

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-YWx0ZXI