"pro-drop language" meaning in All languages combined

{
  "forms": [
    {
      "form": "pro-drop languages",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "pro-drop language"
      },
      "expansion": "pro-drop language (plural pro-drop languages)",
      "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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Linguistics",
          "orig": "en:Linguistics",
          "parents": [
            "Language",
            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A language that usually leaves out certain pronouns in situations usually specific to the language or language family; for example, Spanish and Persian, which frequently drop subject-form pronouns."
      ],
      "id": "en-pro-drop_language-en-noun-ui9SPzhQ",
      "links": [
        [
          "pronoun",
          "pronoun"
        ],
        [
          "language family",
          "language family"
        ],
        [
          "Spanish",
          "Spanish#English"
        ],
        [
          "Persian",
          "Persian#English"
        ],
        [
          "subject",
          "subject#English"
        ]
      ],
      "wikipedia": [
        "pro-drop language"
      ]
    }
  ],
  "word": "pro-drop language"
}

{
  "forms": [
    {
      "form": "pro-drop languages",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "pro-drop language"
      },
      "expansion": "pro-drop language (plural pro-drop languages)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with redundant head parameter",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Linguistics"
      ],
      "glosses": [
        "A language that usually leaves out certain pronouns in situations usually specific to the language or language family; for example, Spanish and Persian, which frequently drop subject-form pronouns."
      ],
      "links": [
        [
          "pronoun",
          "pronoun"
        ],
        [
          "language family",
          "language family"
        ],
        [
          "Spanish",
          "Spanish#English"
        ],
        [
          "Persian",
          "Persian#English"
        ],
        [
          "subject",
          "subject#English"
        ]
      ],
      "wikipedia": [
        "pro-drop language"
      ]
    }
  ],
  "word": "pro-drop language"
}