"chain group" meaning in English

{
  "forms": [
    {
      "form": "kth chain group",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "chain groups",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "kth chain group"
      },
      "expansion": "kth chain group (plural chain groups)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Algebraic topology",
          "orig": "en:Algebraic topology",
          "parents": [
            "Algebra",
            "Topology",
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A free abelian group generated by all the k-dimensional oriented simplices of a given simplicial complex."
      ],
      "holonyms": [
        {
          "word": "chain complex"
        }
      ],
      "id": "en-chain_group-en-noun-7a~ZI~ZV",
      "links": [
        [
          "algebraic topology",
          "algebraic topology"
        ],
        [
          "free abelian group",
          "free abelian group"
        ],
        [
          "simplicial complex",
          "simplicial complex"
        ]
      ],
      "raw_glosses": [
        "(algebraic topology) A free abelian group generated by all the k-dimensional oriented simplices of a given simplicial complex."
      ],
      "topics": [
        "algebraic-topology",
        "mathematics",
        "sciences",
        "topology"
      ]
    }
  ],
  "word": "chain group"
}

{
  "forms": [
    {
      "form": "kth chain group",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "chain groups",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "kth chain group"
      },
      "expansion": "kth chain group (plural chain groups)",
      "name": "en-noun"
    }
  ],
  "holonyms": [
    {
      "word": "chain complex"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Algebraic topology"
      ],
      "glosses": [
        "A free abelian group generated by all the k-dimensional oriented simplices of a given simplicial complex."
      ],
      "links": [
        [
          "algebraic topology",
          "algebraic topology"
        ],
        [
          "free abelian group",
          "free abelian group"
        ],
        [
          "simplicial complex",
          "simplicial complex"
        ]
      ],
      "raw_glosses": [
        "(algebraic topology) A free abelian group generated by all the k-dimensional oriented simplices of a given simplicial complex."
      ],
      "topics": [
        "algebraic-topology",
        "mathematics",
        "sciences",
        "topology"
      ]
    }
  ],
  "word": "chain group"
}