*SET-U

English word origin

Etymology of triad

PIE word *tréyes From Latin triad-, stem of trias (“three, triad”), from Ancient Greek τριάς (triás). By surface analysis, tri- + -ad. Sense 3 (“branch of a Chinese underground criminal society”) is due to the word being

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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 ↗
noun

A grouping of three. · A romantic or sexual relationship between three individuals; a throuple. · A word of three syllables. · A branch of a Chinese underground criminal society, mostly based in Hong Kong.

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

PIE word *tréyes From Latin triad-, stem of trias (“three, triad”), from Ancient Greek τριάς (triás). By surface analysis, tri- + -ad. Sense 3 (“branch of a Chinese underground criminal society”) is due to the word being applied by the British authorities to underground society in Hong Kong based on the geometry of the Chinese character, derived from a name used by some of those societies, 三合會 /三合会 (sānhéhuì, “Three Harmonies Society”), referring to the union between heaven, earth, and humanity.

Relationships mentioned by the source

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

This page abbreviates 2 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": "dercat",
      "args": {
        "1": "en",
        "2": "ine-pro"
      },
      "expansion": ""
    },
    {
      "name": "langname",
      "args": {
        "1": "ine-pro"
      },
      "expansion": "Proto-Indo-European"
    },
    {
      "name": "word",
      "args": {
        "1": "en",
        "2": "ine",
        "3": "tréyes",
        "id": ""
      },
      "expansion": ""
    },
    {
      "name": "PIE word",
      "args": {
        "1": "en",
        "2": "tréyes"
      },
      "expansion": "PIE word\n *tréyes"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "la",
        "3": "triad-"
      },
      "expansion": "Latin triad-"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "grc",
        "3": "τριάς"
      },
      "expansion": "Ancient Greek τριάς (triás)"
    },
    {
      "name": "surf",
      "args": {
        "1": "en",
        "2": "tri-",
        "3": "-ad"
      },
      "expansion": "By surface analysis, tri- + -ad"
    }
  ],
  "links": [
    [
      "*tréyes",
      "Reconstruction:Proto-Indo-European/tréyes"
    ],
    [
      "triad-",
      "triad-#Latin"
    ],
    [
      "trias",
      "trias#Latin"
    ],
    [
      "τριάς",
      "τριάς#Ancient_Greek"
    ],
    [
      "tri-",
      "tri-#English"
    ],
    [
      "-ad",
      "-ad#English"
    ],
    [
      "三合會",
      "三合會#Chinese"
    ],
    [
      "三合会",
      "三合会#Chinese"
    ]
  ],
  "references": [],
  "descendants": [
    {
      "lang": "Ukrainian",
      "lang_code": "uk",
      "word": "тріа́да",
      "raw_tags": [
        "borrowed"
      ],
      "roman": "triáda"
    }
  ],
  "lexical": [
    {
      "pos": "noun",
      "glosses": [
        "A grouping of three.",
        "A romantic or sexual relationship between three individuals; a throuple.",
        "A word of three syllables.",
        "A branch of a Chinese underground criminal society, mostly based in Hong Kong."
      ],
      "tags": [],
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      "sourceRecordOrdinal": 189302
    }
  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
    "links": 0,
    "references": 0,
    "descendants": 0,
    "lexicalRecords": 0,
    "lexicalSenses": 2,
    "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 triad →

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-dHJpYWQ