"heterochromation" meaning in English

{
  "forms": [
    {
      "form": "heterochromations",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "heterochromation (plural heterochromations)",
      "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": "other",
          "name": "English terms prefixed with hetero-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -ion",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Cytology",
          "orig": "en:Cytology",
          "parents": [
            "Biology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The formation of a complex with heterochromatin"
      ],
      "id": "en-heterochromation-en-noun-t9M7lap6",
      "links": [
        [
          "complex",
          "complex"
        ],
        [
          "heterochromatin",
          "heterochromatin"
        ]
      ]
    }
  ],
  "word": "heterochromation"
}

{
  "forms": [
    {
      "form": "heterochromations",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "heterochromation (plural heterochromations)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms prefixed with hetero-",
        "English terms suffixed with -ion",
        "Pages with 1 entry",
        "en:Cytology"
      ],
      "glosses": [
        "The formation of a complex with heterochromatin"
      ],
      "links": [
        [
          "complex",
          "complex"
        ],
        [
          "heterochromatin",
          "heterochromatin"
        ]
      ]
    }
  ],
  "word": "heterochromation"
}