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English word origin

Etymology of folio

From Middle English folio (“leaf of a book”), borrowed from Medieval Latin foliō, Late Latin foliō, Latin foliō, the ablative singular form of Late Latin folium (“leaf or sheet of paper”), Latin folium (“leaf of a plant”

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 leaf of a book or manuscript. · A page of a book, that is, one side of a leaf of a book. · A page number. The even folios are on the left-hand pages and the odd folios on the right-hand pages. · A sheet of paper folded in half.

verb

To put a serial number on (a folio or page, or on all the folios or pages of a book); to foliate, to page.

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

From Middle English folio (“leaf of a book”), borrowed from Medieval Latin foliō, Late Latin foliō, Latin foliō, the ablative singular form of Late Latin folium (“leaf or sheet of paper”), Latin folium (“leaf of a plant”), ultimately from Proto-Indo-European *bʰleh₃- (“bloom, flower”). Doublet of foil and folium, and distantly related to phyllo and phyllon. Senses 1, 2, 3.1, 5, and 6 relating to a leaf or page are derived from Medieval Latin foliō in references; sense 5 (“page in an account book”) may be derived from Italian foglio (“rectangular sheet of paper”), from Latin folium. Senses 3.2 and 3.3 relating to a paper size are from Italian in foglio or its etymon Latin in foliō.

Relationships mentioned by the source

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

This page abbreviates 5 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.

{
  "templates": [
    {
      "name": "root",
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*bʰleh₃-"
      },
      "expansion": ""
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "enm",
        "3": "folio",
        "t": "leaf of a book"
      },
      "expansion": "Middle English folio (“leaf of a book”)"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "la-med",
        "3": "foliō"
      },
      "expansion": "Medieval Latin foliō"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "la-lat",
        "3": "foliō"
      },
      "expansion": "Late Latin foliō"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "la",
        "3": "foliō"
      },
      "expansion": "Latin foliō"
    },
    {
      "name": "glossary",
      "args": {
        "1": "ablative"
      },
      "expansion": "ablative"
    },
    {
      "name": "glossary",
      "args": {
        "1": "singular"
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      "expansion": "singular"
    },
    {
      "name": "der",
      "args": {
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        "2": "la-lat",
        "3": "folium",
        "t": "leaf or sheet of paper"
      },
      "expansion": "Late Latin folium (“leaf or sheet of paper”)"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "la",
        "3": "folium",
        "t": "leaf of a plant"
      },
      "expansion": "Latin folium (“leaf of a plant”)"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*bʰleh₃-",
        "t": "bloom, flower"
      },
      "expansion": "Proto-Indo-European *bʰleh₃- (“bloom, flower”)"
    },
    {
      "name": "doublet",
      "args": {
        "1": "en",
        "2": "foil",
        "3": "folium"
      },
      "expansion": "Doublet of foil and folium"
    },
    {
      "name": "doublet",
      "args": {
        "1": "en",
        "2": "phyllo",
        "3": "phyllon",
        "notext": "1"
      },
      "expansion": "phyllo and phyllon"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "la-med",
        "3": "foliō"
      },
      "expansion": "Medieval Latin foliō"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "it",
        "3": "foglio",
        "t": "rectangular sheet of paper"
      },
      "expansion": "Italian foglio (“rectangular sheet of paper”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "la",
        "2": "folium"
      },
      "expansion": "Latin folium"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "it",
        "3": "in foglio"
      },
      "expansion": "Italian in foglio"
    },
    {
      "name": "glossary",
      "args": {
        "1": "etymon"
      },
      "expansion": "etymon"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "la",
        "3": "in foliō"
      },
      "expansion": "Latin in foliō"
    }
  ],
  "links": [
    [
      "folio",
      "folio#Middle_English"
    ],
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      "foliō",
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      "foliō",
      "folio#Latin"
    ],
    [
      "foliō",
      "folio#Latin"
    ],
    [
      "folium",
      "folium#Latin"
    ],
    [
      "folium",
      "folium#Latin"
    ],
    [
      "*bʰleh₃-",
      "Reconstruction:Proto-Indo-European/bʰleh₃-"
    ],
    [
      "foil",
      "foil#English"
    ],
    [
      "folium",
      "folium#English"
    ],
    [
      "phyllo",
      "phyllo#English"
    ],
    [
      "phyllon",
      "phyllon#English"
    ],
    [
      "foliō",
      "folio#Latin"
    ],
    [
      "foglio",
      "foglio#Italian"
    ],
    [
      "folium",
      "folium#Latin"
    ],
    [
      "in",
      "in#Italian"
    ],
    [
      "foglio",
      "foglio#Italian"
    ],
    [
      "in",
      "in#Latin"
    ],
    [
      "foliō",
      "folio#Latin"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "noun",
      "glosses": [
        "A leaf of a book or manuscript.",
        "A page of a book, that is, one side of a leaf of a book.",
        "A page number. The even folios are on the left-hand pages and the odd folios on the right-hand pages.",
        "A sheet of paper folded in half."
      ],
      "tags": [
        "broadly"
      ],
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      "sourceRecordOrdinal": 416922
    },
    {
      "pos": "verb",
      "glosses": [
        "To put a serial number on (a folio or page, or on all the folios or pages of a book); to foliate, to page."
      ],
      "tags": [
        "transitive"
      ],
      "recordId": "4d38d95f1881b73ef6b5860047dce962780dae51037864a205f729972590f126",
      "rawRecordSha256": "cf074b33b0488ea4566e8470747bf583977a42ab7c789c458224677be8fc0243",
      "sourceRecordOrdinal": 416923
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  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
    "links": 0,
    "references": 0,
    "descendants": 0,
    "lexicalRecords": 0,
    "lexicalSenses": 5,
    "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 folio →

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
73216b9a9b78ed3830994bf853103716f5a4dc57099e371e9f8fdc468facca26
Permanent entry ID
w-Zm9saW8