"widening conversion" meaning in English

{
  "forms": [
    {
      "form": "widening conversions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "widening conversion (plural widening conversions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "antonyms": [
        {
          "word": "narrowing conversion"
        }
      ],
      "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": "Programming",
          "orig": "en:Programming",
          "parents": [
            "Computing",
            "Software engineering",
            "Technology",
            "Computer science",
            "Engineering",
            "Software",
            "All topics",
            "Sciences",
            "Applied sciences",
            "Media",
            "Fundamental",
            "Communication"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A conversion from one data type to another where the new data type’s size is the same or greater than the old one’s, guaranteeing that there will be no loss of information."
      ],
      "id": "en-widening_conversion-en-noun-lHRD8IlG",
      "links": [
        [
          "programming",
          "programming#Noun"
        ],
        [
          "data type",
          "data type"
        ]
      ],
      "raw_glosses": [
        "(programming) A conversion from one data type to another where the new data type’s size is the same or greater than the old one’s, guaranteeing that there will be no loss of information."
      ],
      "topics": [
        "computing",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "programming",
        "sciences"
      ]
    }
  ],
  "word": "widening conversion"
}

{
  "forms": [
    {
      "form": "widening conversions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "widening conversion (plural widening conversions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "antonyms": [
        {
          "word": "narrowing conversion"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Programming"
      ],
      "glosses": [
        "A conversion from one data type to another where the new data type’s size is the same or greater than the old one’s, guaranteeing that there will be no loss of information."
      ],
      "links": [
        [
          "programming",
          "programming#Noun"
        ],
        [
          "data type",
          "data type"
        ]
      ],
      "raw_glosses": [
        "(programming) A conversion from one data type to another where the new data type’s size is the same or greater than the old one’s, guaranteeing that there will be no loss of information."
      ],
      "topics": [
        "computing",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "programming",
        "sciences"
      ]
    }
  ],
  "word": "widening conversion"
}