"dead key" meaning in English

{
  "forms": [
    {
      "form": "dead keys",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "dead key (plural dead keys)",
      "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 entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Typing keyboards",
          "orig": "en:Typing keyboards",
          "parents": [
            "Writing instruments",
            "Stationery",
            "Tools",
            "Writing",
            "Technology",
            "Human behaviour",
            "Language",
            "All topics",
            "Human",
            "Communication",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A special modifier key on a typewriter or computer keyboard, typically used to attach a specific diacritic to another character."
      ],
      "id": "en-dead_key-en-noun-8a5Lj6gT",
      "links": [
        [
          "modifier key",
          "modifier key"
        ],
        [
          "typewriter",
          "typewriter"
        ],
        [
          "computer",
          "computer"
        ],
        [
          "keyboard",
          "keyboard"
        ],
        [
          "diacritic",
          "diacritic"
        ],
        [
          "character",
          "character"
        ]
      ],
      "translations": [
        {
          "code": "eo",
          "lang": "Esperanto",
          "sense": "special modifier key on a typewriter or computer keyboard",
          "word": "senpaŝa klavo"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "special modifier key on a typewriter or computer keyboard",
          "word": "päällekkäisnäppäin"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "special modifier key on a typewriter or computer keyboard",
          "word": "tarkenäppäin"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "special modifier key on a typewriter or computer keyboard",
          "tags": [
            "feminine"
          ],
          "word": "touche morte"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "special modifier key on a typewriter or computer keyboard",
          "tags": [
            "feminine"
          ],
          "word": "Tottaste"
        },
        {
          "code": "vi",
          "lang": "Vietnamese",
          "sense": "special modifier key on a typewriter or computer keyboard",
          "word": "phím ảo"
        }
      ],
      "wikipedia": [
        "dead key"
      ]
    }
  ],
  "word": "dead key"
}

{
  "forms": [
    {
      "form": "dead keys",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "dead key (plural dead keys)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "en:Typing keyboards"
      ],
      "glosses": [
        "A special modifier key on a typewriter or computer keyboard, typically used to attach a specific diacritic to another character."
      ],
      "links": [
        [
          "modifier key",
          "modifier key"
        ],
        [
          "typewriter",
          "typewriter"
        ],
        [
          "computer",
          "computer"
        ],
        [
          "keyboard",
          "keyboard"
        ],
        [
          "diacritic",
          "diacritic"
        ],
        [
          "character",
          "character"
        ]
      ],
      "wikipedia": [
        "dead key"
      ]
    }
  ],
  "translations": [
    {
      "code": "eo",
      "lang": "Esperanto",
      "sense": "special modifier key on a typewriter or computer keyboard",
      "word": "senpaŝa klavo"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "special modifier key on a typewriter or computer keyboard",
      "word": "päällekkäisnäppäin"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "special modifier key on a typewriter or computer keyboard",
      "word": "tarkenäppäin"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "special modifier key on a typewriter or computer keyboard",
      "tags": [
        "feminine"
      ],
      "word": "touche morte"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "special modifier key on a typewriter or computer keyboard",
      "tags": [
        "feminine"
      ],
      "word": "Tottaste"
    },
    {
      "code": "vi",
      "lang": "Vietnamese",
      "sense": "special modifier key on a typewriter or computer keyboard",
      "word": "phím ảo"
    }
  ],
  "word": "dead key"
}