"diæresis" meaning in English

{
  "forms": [
    {
      "form": "diæreses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "diæreses"
      },
      "expansion": "diæresis (plural diæreses)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "diaeresis"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Diacritical marks",
          "orig": "en:Diacritical marks",
          "parents": [
            "Letters, symbols, and punctuation",
            "Symbols",
            "Orthography",
            "Writing",
            "Human behaviour",
            "Language",
            "Human",
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Archaic spelling of diaeresis."
      ],
      "id": "en-diæresis-en-noun-VaIwUD8i",
      "links": [
        [
          "diaeresis",
          "diaeresis#English"
        ]
      ],
      "tags": [
        "alt-of",
        "archaic"
      ]
    }
  ],
  "word": "diæresis"
}

{
  "forms": [
    {
      "form": "diæreses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "diæreses"
      },
      "expansion": "diæresis (plural diæreses)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "diaeresis"
        }
      ],
      "categories": [
        "English archaic forms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English nouns with irregular plurals",
        "English terms spelled with Æ",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Diacritical marks"
      ],
      "glosses": [
        "Archaic spelling of diaeresis."
      ],
      "links": [
        [
          "diaeresis",
          "diaeresis#English"
        ]
      ],
      "tags": [
        "alt-of",
        "archaic"
      ]
    }
  ],
  "word": "diæresis"
}