"edge contraction" meaning in English

{
  "forms": [
    {
      "form": "edge contractions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "edge contraction (plural edge contractions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
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        {
          "kind": "other",
          "langcode": "en",
          "name": "Graph theory",
          "orig": "en:Graph theory",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              14,
              30
            ]
          ],
          "text": "Performing an edge contraction on an edge in a path graph results in a path graph with one fewer vertex.",
          "type": "example"
        }
      ],
      "glosses": [
        "An operation performed on an edge in a graph which deletes the edge, replaces its endpoints with a single new vertex, and replaces edges incident to either endpoint with an edge incident to the new vertex."
      ],
      "id": "en-edge_contraction-en-noun-75maRZJ3",
      "links": [
        [
          "graph theory",
          "graph theory"
        ]
      ],
      "raw_glosses": [
        "(graph theory) An operation performed on an edge in a graph which deletes the edge, replaces its endpoints with a single new vertex, and replaces edges incident to either endpoint with an edge incident to the new vertex."
      ],
      "topics": [
        "graph-theory",
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "edge contraction"
}

{
  "forms": [
    {
      "form": "edge contractions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "edge contraction (plural edge contractions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
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        "en:Graph theory"
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      "examples": [
        {
          "bold_text_offsets": [
            [
              14,
              30
            ]
          ],
          "text": "Performing an edge contraction on an edge in a path graph results in a path graph with one fewer vertex.",
          "type": "example"
        }
      ],
      "glosses": [
        "An operation performed on an edge in a graph which deletes the edge, replaces its endpoints with a single new vertex, and replaces edges incident to either endpoint with an edge incident to the new vertex."
      ],
      "links": [
        [
          "graph theory",
          "graph theory"
        ]
      ],
      "raw_glosses": [
        "(graph theory) An operation performed on an edge in a graph which deletes the edge, replaces its endpoints with a single new vertex, and replaces edges incident to either endpoint with an edge incident to the new vertex."
      ],
      "topics": [
        "graph-theory",
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "edge contraction"
}