"half-plate" meaning in English

{
  "forms": [
    {
      "form": "half-plates",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "half-plate (plural half-plates)",
      "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": "topical",
          "langcode": "en",
          "name": "Photography",
          "orig": "en:Photography",
          "parents": [
            "Art",
            "Human activity",
            "Media",
            "Culture",
            "Human behaviour",
            "Communication",
            "Society",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "quarter-plate"
        },
        {
          "word": "whole plate"
        }
      ],
      "glosses": [
        "A photographic plate measuring 4¾ by 6½ inches in Britain (4¼ by 5½ in the US)."
      ],
      "id": "en-half-plate-en-noun-b3b4V7Gz",
      "links": [
        [
          "photography",
          "photography"
        ]
      ],
      "raw_glosses": [
        "(photography, historical) A photographic plate measuring 4¾ by 6½ inches in Britain (4¼ by 5½ in the US)."
      ],
      "tags": [
        "historical"
      ],
      "topics": [
        "arts",
        "hobbies",
        "lifestyle",
        "photography"
      ]
    }
  ],
  "word": "half-plate"
}

{
  "coordinate_terms": [
    {
      "word": "quarter-plate"
    },
    {
      "word": "whole plate"
    }
  ],
  "forms": [
    {
      "form": "half-plates",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "half-plate (plural half-plates)",
      "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 historical senses",
        "en:Photography"
      ],
      "glosses": [
        "A photographic plate measuring 4¾ by 6½ inches in Britain (4¼ by 5½ in the US)."
      ],
      "links": [
        [
          "photography",
          "photography"
        ]
      ],
      "raw_glosses": [
        "(photography, historical) A photographic plate measuring 4¾ by 6½ inches in Britain (4¼ by 5½ in the US)."
      ],
      "tags": [
        "historical"
      ],
      "topics": [
        "arts",
        "hobbies",
        "lifestyle",
        "photography"
      ]
    }
  ],
  "word": "half-plate"
}