*SET-U

English word origin

Etymology of plain

From Middle English pleyn, borrowed from Anglo-Norman pleyn, playn, Middle French plain, plein, and Old French plain, from Latin plānus (“flat, even, level, plain”). Doublet of llano, piano, plane, and plan.

4 source sectionsExtended source reportWiktionary original ↗
In this entry · 4 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 ↗
adv

Simply. · Plainly; distinctly.

adj

Flat, level. · Ordinary; lacking adornment or ornamentation; unembellished. · Of just one colour; lacking a pattern. · Simple in habits or qualities; unsophisticated, not exceptional, ordinary.

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

From Middle English pleyn, borrowed from Anglo-Norman pleyn, playn, Middle French plain, plein, and Old French plain, from Latin plānus (“flat, even, level, plain”). Doublet of llano, piano, plane, and plan.

Relationships mentioned by the source

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

This page abbreviates 8 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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  "templates": [
    {
      "name": "root",
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*pleh₂-"
      },
      "expansion": ""
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "enm",
        "3": "pleyn"
      },
      "expansion": "Middle English pleyn"
    },
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      "args": {
        "1": "en",
        "2": "xno",
        "3": "pleyn"
      },
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    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "frm",
        "3": "plain"
      },
      "expansion": "Middle French plain"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "fro",
        "3": "plain"
      },
      "expansion": "Old French plain"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "la",
        "3": "plānus",
        "4": "",
        "5": "flat, even, level, plain"
      },
      "expansion": "Latin plānus (“flat, even, level, plain”)"
    },
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      "name": "doublet",
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        "3": "piano",
        "4": "plane",
        "5": "plan"
      },
      "expansion": "Doublet of llano, piano, plane, and plan"
    }
  ],
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      "pleyn#Middle_English"
    ],
    [
      "pleyn",
      "pleyn#Old_French"
    ],
    [
      "playn",
      "playn#Old_French"
    ],
    [
      "plain",
      "plain#Middle_French"
    ],
    [
      "plein",
      "plein#Middle_French"
    ],
    [
      "plain",
      "plain#Old_French"
    ],
    [
      "plānus",
      "planus#Latin"
    ],
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      "llano",
      "llano#English"
    ],
    [
      "piano",
      "piano#English"
    ],
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      "plane",
      "plane#English"
    ],
    [
      "plan",
      "plan#English"
    ]
  ],
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        "Simply.",
        "Plainly; distinctly."
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        "not-comparable",
        "archaic"
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        "Simple in habits or qualities; unsophisticated, not exceptional, ordinary."
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}

Source etymology 2

Original entry ↗
verb

To level; to raze; to make plain or even on the surface. · To make plain or manifest; to explain.

noun

An expanse of land with relatively low relief and few trees, especially a grassy expanse. · A broad, flat expanse in general, as of water. · Synonym of field in reference to a battlefield. · Alternative spelling of plane: a flat geometric field.

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

From Old French plain, from Latin plānum (“level ground, a plain”), neuter substantive from plānus (“level, even, flat”). Doublet of llano, piano, and plane.

Relationships mentioned by the source

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

  • Derivation mentionplainfro
  • Derivation mentionplānumla · level ground, a plain
  • Doublet mentionllanoen
  • Doublet mentionpianoen
  • Doublet mentionplaneen
Inspect preserved source fields

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

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        "1": "en",
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        "3": "plain"
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      "expansion": "Old French plain"
    },
    {
      "name": "der",
      "args": {
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        "2": "la",
        "3": "plānum",
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      },
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    },
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      "planus#Latin"
    ],
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      "llano#English"
    ],
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      "piano#English"
    ],
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      "plane",
      "plane#English"
    ]
  ],
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  "descendants": [],
  "lexical": [
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        "To level; to raze; to make plain or even on the surface.",
        "To make plain or manifest; to explain."
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        "obsolete",
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Source etymology 3

Original entry ↗
verb

To complain. · To lament, bewail.

noun

A lamentation.

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

From Anglo-Norman plainer, pleiner, variant of Anglo-Norman and Old French pleindre, plaindre, from Latin plangere.

Relationships mentioned by the source

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

Inspect preserved source fields

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

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        "3": "plainer"
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    },
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      "name": "cog",
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        "2": "-"
      },
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    },
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      "args": {
        "1": "en",
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        "3": "pleindre"
      },
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    },
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      "name": "der",
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    }
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      "pleindre#Old_French"
    ],
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      "plaindre#Old_French"
    ],
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      "plango#Latin"
    ]
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Source etymology 4

Original entry ↗
adj

Full, complete in number or extent.

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

From Middle English pleyn, borrowed from Old French plein, from Latin plēnus (“full, filled, complete”). Ultimately from Proto-Italic *plēnos, from Proto-Indo-European *pl̥h₁nós (“full”). Doublet of plene, plenary, and full.

Relationships mentioned by the source

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

Inspect preserved source fields

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

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        "3": "*pleh₁-"
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    },
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    },
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    },
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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 plain →

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
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Import run
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Permanent entry ID
w-cGxhaW4