{
  "id": "once.temporal",
  "term": "once",
  "sense": "temporal",
  "pos": "adjective",
  "status": "review",
  "level": 5,
  "arena": "once",
  "domain": "temporal",
  "style": null,
  "definition": "a change that happened a single time in the previous",
  "folk_gloss": null,
  "emergence": {
    "components": [
      "single.quantity",
      "change.process",
      "previous.temporal",
      "time.dimension",
      "happen.event-occurrence"
    ],
    "interaction": "a single change occurs before now",
    "novel_properties": [
      "singular past occurrence",
      "completed change instance",
      "temporally bounded event"
    ]
  },
  "examples": [
    {
      "text": "The Chicxulub impact altered Earth's climate within hours, ending the Cretaceous period 66 million years ago.",
      "domain": "geology"
    },
    {
      "text": "The 2003 Northeast blackout began with a single relay failure in Ohio, cascading to 55 million people.",
      "domain": "engineering"
    },
    {
      "text": "The Bitcoin network adjusted its difficulty for the first time on January 9, 2009, after block 24.",
      "domain": "computing"
    }
  ],
  "relations": [
    {
      "id": "previous.temporal",
      "note": "is-a",
      "type": "contrasts-with"
    }
  ],
  "used_by": [
    "integrity.state",
    "proportion.relation"
  ],
  "forms": [
    "once"
  ],
  "closed": true,
  "provenance": {
    "author": "openrouter:openai/gpt-oss-120b",
    "date": "2026-07-29",
    "confidence": 0.6,
    "reconciled": {
      "by": "openrouter:qwen/qwen3-235b-a22b-2507",
      "date": "2026-07-31",
      "changed": "factual",
      "note": "Added 'happen.event-occurrence' to align definition and emergence record; definition was factually incomplete without acknowledging occurrence."
    }
  },
  "canonical": "https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-once.temporal"
}