{
  "id": "threshold.boundary",
  "term": "threshold",
  "sense": "boundary",
  "pos": "noun",
  "status": "review",
  "level": 11,
  "arena": "emergence",
  "domain": "window",
  "style": "window",
  "definition": "a wall where the parameter's window ends, beyond which the system cannot persist or transforms into something categorically different",
  "folk_gloss": null,
  "emergence": {
    "components": [
      "wall.range-end",
      "parameter.condition",
      "window.range",
      "boundary.limit",
      "persist.continue",
      "change.process",
      "difference.relation",
      "system.organized"
    ],
    "interaction": "The components together establish a limiting structure where a system’s persistence is bounded by a parameter range, beyond which either existence ceases or a qualitative transformation occurs.",
    "novel_properties": [
      "limiting threshold structure",
      "persistence boundary",
      "qualitative transformation point"
    ]
  },
  "examples": [
    {
      "text": "The Arctic sea ice extent dropped below 4 million km² in 2012, crossing a tipping point for summer albedo feedback.",
      "domain": "climate"
    },
    {
      "text": "The Tacoma Narrows Bridge collapsed in 1940 when wind speed exceeded 42 mph, initiating uncontrollable torsional oscillation.",
      "domain": "engineering"
    },
    {
      "text": "Bitcoin’s difficulty adjustment resets every 2016 blocks, but halts if block production stops beyond a 12-hour threshold.",
      "domain": "computing"
    }
  ],
  "relations": [],
  "used_by": [
    "factor-of-safety.margin",
    "groundswell.emergence",
    "network-effect.threshold",
    "snowball-effect.stacked-dependency"
  ],
  "forms": [
    "threshold",
    "thresholds"
  ],
  "closed": false,
  "provenance": {
    "author": "retrofit:qwen/qwen3-235b-a22b-2507",
    "date": "2026-07-29",
    "confidence": 0.8,
    "sources": [
      "Sample/hundred-words-six-terms.md"
    ],
    "reconciled": {
      "by": "openrouter:qwen/qwen3-235b-a22b-2507",
      "date": "2026-07-31",
      "changed": "components",
      "note": "Added 'windows.opening' as it is constitutive in the metaphor of a boundary that allows passage or defines a threshold; all other components remain as they are directly implicated in the definition's "
    }
  },
  "canonical": "https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-threshold.boundary"
}