"◌̈" meaning in English

{
  "lang": "English",
  "lang_code": "en",
  "pos": "character",
  "senses": [
    {
      "categories": [],
      "glosses": [
        "Used to indicate that two identical vowels occur in separate morphemes and are pronounced separately: coöperate, reënter, reëstablish, noöne."
      ],
      "id": "en-◌̈-en-character-PzzCokaa",
      "links": [
        [
          "morpheme",
          "morpheme#English"
        ],
        [
          "coöperate",
          "coöperate#English"
        ],
        [
          "reënter",
          "reënter#English"
        ],
        [
          "reëstablish",
          "reëstablish#English"
        ],
        [
          "noöne",
          "noöne#English"
        ]
      ],
      "raw_glosses": [
        "(dated) Used to indicate that two identical vowels occur in separate morphemes and are pronounced separately: coöperate, reënter, reëstablish, noöne."
      ],
      "tags": [
        "dated",
        "diacritic"
      ]
    },
    {
      "glosses": [
        "Used to indicate that the marked vowel is the nucleus of its own syllable: Boötes, Brontë, Chloë, Zoë, (dated) aëroplane, aërial."
      ],
      "id": "en-◌̈-en-character-vDK9Ya-e",
      "links": [
        [
          "Boötes",
          "Boötes#English"
        ],
        [
          "Brontë",
          "Brontë#English"
        ],
        [
          "Chloë",
          "Chloë#English"
        ],
        [
          "Zoë",
          "Zoë#English"
        ],
        [
          "aëroplane",
          "aëroplane#English"
        ],
        [
          "aërial",
          "aërial#English"
        ]
      ],
      "tags": [
        "diacritic"
      ]
    },
    {
      "categories": [
        {
          "_dis": "24 27 49",
          "kind": "topical",
          "name": "English diacritical marks",
          "parents": [
            "Diacritical marks",
            "Letters, symbols, and punctuation",
            "Symbols",
            "Orthography",
            "Writing",
            "Human behaviour",
            "Language",
            "Human",
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "22 27 50",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "28 28 44",
          "kind": "other",
          "name": "English terms in nonstandard scripts",
          "parents": [
            "Terms in nonstandard scripts",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Retained in foreign (mostly French) loan words where vowels are pronounced separately: naïve (or naive), Noël (or Noel), but also for umlaut in German Götterdämmerung, Führer."
      ],
      "id": "en-◌̈-en-character-Ba2AGoVk",
      "links": [
        [
          "naïve",
          "naïve#English"
        ],
        [
          "naive",
          "naive#English"
        ],
        [
          "Noël",
          "Noël#English"
        ],
        [
          "Noel",
          "Noel#English"
        ],
        [
          "Götterdämmerung",
          "Götterdämmerung#English"
        ],
        [
          "Führer",
          "Führer#English"
        ]
      ],
      "tags": [
        "diacritic"
      ]
    }
  ],
  "word": "◌̈"
}

{
  "categories": [
    "English diacritical marks",
    "English entries with incorrect language header",
    "English lemmas",
    "English terms in nonstandard scripts"
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "character",
  "senses": [
    {
      "categories": [
        "English dated terms"
      ],
      "glosses": [
        "Used to indicate that two identical vowels occur in separate morphemes and are pronounced separately: coöperate, reënter, reëstablish, noöne."
      ],
      "links": [
        [
          "morpheme",
          "morpheme#English"
        ],
        [
          "coöperate",
          "coöperate#English"
        ],
        [
          "reënter",
          "reënter#English"
        ],
        [
          "reëstablish",
          "reëstablish#English"
        ],
        [
          "noöne",
          "noöne#English"
        ]
      ],
      "raw_glosses": [
        "(dated) Used to indicate that two identical vowels occur in separate morphemes and are pronounced separately: coöperate, reënter, reëstablish, noöne."
      ],
      "tags": [
        "dated",
        "diacritic"
      ]
    },
    {
      "glosses": [
        "Used to indicate that the marked vowel is the nucleus of its own syllable: Boötes, Brontë, Chloë, Zoë, (dated) aëroplane, aërial."
      ],
      "links": [
        [
          "Boötes",
          "Boötes#English"
        ],
        [
          "Brontë",
          "Brontë#English"
        ],
        [
          "Chloë",
          "Chloë#English"
        ],
        [
          "Zoë",
          "Zoë#English"
        ],
        [
          "aëroplane",
          "aëroplane#English"
        ],
        [
          "aërial",
          "aërial#English"
        ]
      ],
      "tags": [
        "diacritic"
      ]
    },
    {
      "glosses": [
        "Retained in foreign (mostly French) loan words where vowels are pronounced separately: naïve (or naive), Noël (or Noel), but also for umlaut in German Götterdämmerung, Führer."
      ],
      "links": [
        [
          "naïve",
          "naïve#English"
        ],
        [
          "naive",
          "naive#English"
        ],
        [
          "Noël",
          "Noël#English"
        ],
        [
          "Noel",
          "Noel#English"
        ],
        [
          "Götterdämmerung",
          "Götterdämmerung#English"
        ],
        [
          "Führer",
          "Führer#English"
        ]
      ],
      "tags": [
        "diacritic"
      ]
    }
  ],
  "word": "◌̈"
}