*SET-U

English word origin

Etymology of -o

Etymology tree Latin ō Old French ohbor. Middle English o English O ▲ Middle English o English oh English -o Originally a special use of the interjection O or oh appended to street cries and nautical calls to project a h

3 source sectionsExtended source reportWiktionary original ↗
In this entry · 3 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 ↗
suffix

A vocative or exclamative particle appended to street cries, nautical calls, or names to project a hail or shout. · A colloquializing suffix, typically appended to names, abbreviations of long words, or substantive uses of adjectives.

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

Etymology tree Latin ō Old French ohbor. Middle English o English O ▲ Middle English o English oh English -o Originally a special use of the interjection O or oh appended to street cries and nautical calls to project a hail or shout (as in milk-oh, smoke-oh, and sail-ho). Its later use as a colloquializing noun suffix, particularly prominent in Australian English, developed from the substantivation of these cries (e.g., smoko), reinforced by early nautical adaptations of Mediterranean Lingua Franca or pseudo‐Spanish words (such as guardo). As noted by the Australian National Dictionary, this vocative “hailing” origin naturally led to its frequent attachment to personal names to form nicknames (e.g., John‐o, Jacko). Some senses may also derive from o (“one”), from Middle English o, oo, a variant of a, on, oon, an (“one”). See one and -y.

Relationships mentioned by the source

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

  • Inherited-form mentionoenm
Inspect preserved source fields

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

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    {
      "name": "etymon",
      "args": {
        "1": "en",
        "2": "O<id:vocative>",
        "3": "oh<id:surprise>",
        "id": "vocative",
        "tree": "1"
      },
      "expansion": "Etymology tree\nLatin ō\nOld French ohbor.\nMiddle English o\nEnglish O\n▲\nMiddle English o\nEnglish oh\nEnglish -o\n[Appendix:Glossary#loanword|Borrowed]] from\", \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"id\" : \"vocative\", \"children\" : [ ], \"status\" : \"ok\", \"lang_name\" : \"Latin\", \"term\" : \"ō\", \"lang\" : \"la\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Old French\", \"term\" : \"oh\", \"status\" : \"inline\", \"lang\" : \"fro\" } ], \"keyword\" : \"bor\" } ], \"status\" : \"ok\", \"lang_name\" : \"Middle English\", \"term\" : \"o\", \"lang\" : \"enm\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"English\", \"term\" : \"O\", \"lang\" : \"en\" }, { \"id\" : \"surprise\", \"children\" : [ { \"terms\" : [ { \"is_duplicate\" : true, \"children\" : [ ], \"id\" : \"oh\", \"status\" : { \"1\" : \"enm\", \"2\" : \":bor\", \"3\" : \"fro:oh<ety:inh<la:ō<id:vocative>>>\", \"id\" : \"oh\" }, \"lang_name\" : \"Middle English\", \"term\" : \"o\", \"lang\" : \"enm\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"English\", \"term\" : \"oh\", \"lang\" : \"en\" } ], \"keyword_label\" : \"From\", \"keyword\" : \"from\" } ], \"status\" : \"ok\", \"lang_name\" : \"English\", \"term\" : \"-o\", \"lang\" : \"en\" }\" data-id=\"vocative\" data-lang=\"en\" data-title=\"-o\" id=\"English:_vocative\">"
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "enm",
        "3": "o"
      },
      "expansion": "Middle English o"
    },
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      "name": "etymon",
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        "1": "en",
        "2": "O<id:vocative>",
        "3": "oh<id:surprise>",
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        "tree": "1"
      },
      "expansion": "Etymology tree\nLatin ō\nOld French ohbor.\nMiddle English o\nEnglish O\n▲\nMiddle English o\nEnglish oh\nEnglish -o"
    }
  ],
  "links": [
    [
      "ō",
      "o#Latin:_vocative"
    ],
    [
      "oh",
      "oh#Old_French"
    ],
    [
      "o",
      "o#Middle_English:_oh"
    ],
    [
      "O",
      "O#English:_vocative"
    ],
    [
      "o",
      "o#Middle_English:_oh"
    ],
    [
      "oh",
      "oh#English:_surprise"
    ],
    [
      "O",
      "O#English"
    ],
    [
      "oh",
      "oh#English"
    ],
    [
      "street cries",
      "street cry"
    ],
    [
      "nautical",
      "nautical"
    ],
    [
      "call",
      "call"
    ],
    [
      "project",
      "project"
    ],
    [
      "hail",
      "hail"
    ],
    [
      "shout",
      "shout"
    ],
    [
      "milk-oh",
      "milk-oh#English"
    ],
    [
      "smoke-oh",
      "smoke-oh#English"
    ],
    [
      "sail-ho",
      "sail-ho#English"
    ],
    [
      "Australian English",
      "Australian English"
    ],
    [
      "substantivation",
      "substantivation"
    ],
    [
      "smoko",
      "smoko#English"
    ],
    [
      "Mediterranean Lingua Franca",
      "Mediterranean Lingua Franca"
    ],
    [
      "guardo",
      "guardo#English"
    ],
    [
      "o",
      "o#English"
    ],
    [
      "o",
      "o#Middle_English"
    ],
    [
      "oo",
      "oo#Middle_English"
    ],
    [
      "a",
      "a#English"
    ],
    [
      "on",
      "on#Middle_English"
    ],
    [
      "oon",
      "oon#Middle_English"
    ],
    [
      "an",
      "an#Middle_English"
    ],
    [
      "one",
      "one#English"
    ],
    [
      "-y",
      "-y#English"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
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      "pos": "suffix",
      "glosses": [
        "A vocative or exclamative particle appended to street cries, nautical calls, or names to project a hail or shout.",
        "A colloquializing suffix, typically appended to names, abbreviations of long words, or substantive uses of adjectives."
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Source etymology 2

Original entry ↗
suffix

Converts certain words to faux Italian or Spanish. Can be used with Spanish el for expressions such as el stinko.

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

From many Spanish or Italian words that end in o. This ending in such Spanish or Italian words generally derives from -um, the accusative singular inflectional ending for masculine and neuter nouns in Latin.

Inspect preserved source fields

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

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  "templates": [
    {
      "name": "etymid",
      "args": {
        "1": "en",
        "2": "Spanish"
      },
      "expansion": ""
    },
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      "name": "der",
      "args": {
        "1": "en",
        "2": "es",
        "3": "-"
      },
      "expansion": "Spanish"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "it",
        "3": "-"
      },
      "expansion": "Italian"
    }
  ],
  "links": [
    [
      "-um",
      "-um#Latin"
    ]
  ],
  "references": [],
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  "lexical": [
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Source etymology 3

Original entry ↗
suffix

Added to verb stems to create a noun describing an error relating to the action described by the verb.

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

Rebracketing of typo.

Inspect preserved source fields

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

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      "name": "rebracketing",
      "args": {
        "1": "en",
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      },
      "expansion": "Rebracketing of typo"
    }
  ],
  "links": [
    [
      "typo",
      "typo#English"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "suffix",
      "glosses": [
        "Added to verb stems to create a noun describing an error relating to the action described by the verb."
      ],
      "tags": [
        "morpheme"
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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 -o →

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-LW8