"mersion" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "la",
        "3": "mersio"
      },
      "expansion": "Latin mersio",
      "name": "uder"
    },
    {
      "args": {
        "1": "en",
        "2": "merge"
      },
      "expansion": "merge",
      "name": "m"
    }
  ],
  "etymology_text": "From Latin mersio. See merge.",
  "forms": [
    {
      "form": "mersions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "mersion (countable and uncountable, plural mersions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "immersion"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English undefined derivations",
          "parents": [
            "Undefined derivations",
            "Entry maintenance"
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          "source": "w"
        }
      ],
      "glosses": [
        "Obsolete form of immersion."
      ],
      "id": "en-mersion-en-noun-q675EafN",
      "links": [
        [
          "immersion",
          "immersion#English"
        ]
      ],
      "tags": [
        "alt-of",
        "countable",
        "obsolete",
        "uncountable"
      ]
    }
  ],
  "word": "mersion"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "la",
        "3": "mersio"
      },
      "expansion": "Latin mersio",
      "name": "uder"
    },
    {
      "args": {
        "1": "en",
        "2": "merge"
      },
      "expansion": "merge",
      "name": "m"
    }
  ],
  "etymology_text": "From Latin mersio. See merge.",
  "forms": [
    {
      "form": "mersions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "mersion (countable and uncountable, plural mersions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "immersion"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English obsolete forms",
        "English terms derived from Latin",
        "English uncountable nouns",
        "English undefined derivations"
      ],
      "glosses": [
        "Obsolete form of immersion."
      ],
      "links": [
        [
          "immersion",
          "immersion#English"
        ]
      ],
      "tags": [
        "alt-of",
        "countable",
        "obsolete",
        "uncountable"
      ]
    }
  ],
  "word": "mersion"
}