"transition layer" meaning in English

{
  "forms": [
    {
      "form": "transition layers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "2": "+"
      },
      "expansion": "transition layer (usually uncountable, plural transition layers)",
      "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": "Aviation",
          "orig": "en:Aviation",
          "parents": [
            "Aeronautics",
            "Transport",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The airspace above the transition altitude but below the transition level."
      ],
      "id": "en-transition_layer-en-noun-JWxRwX3L",
      "links": [
        [
          "aviation",
          "aviation"
        ],
        [
          "airspace",
          "airspace"
        ],
        [
          "transition altitude",
          "transition altitude"
        ],
        [
          "transition level",
          "transition level"
        ]
      ],
      "raw_glosses": [
        "(aviation) The airspace above the transition altitude but below the transition level."
      ],
      "related": [
        {
          "word": "transition altitude"
        },
        {
          "word": "transition level"
        }
      ],
      "tags": [
        "uncountable",
        "usually"
      ],
      "topics": [
        "aeronautics",
        "aerospace",
        "aviation",
        "business",
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "transition layer"
}

{
  "forms": [
    {
      "form": "transition layers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "2": "+"
      },
      "expansion": "transition layer (usually uncountable, plural transition layers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "transition altitude"
    },
    {
      "word": "transition level"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "en:Aviation"
      ],
      "glosses": [
        "The airspace above the transition altitude but below the transition level."
      ],
      "links": [
        [
          "aviation",
          "aviation"
        ],
        [
          "airspace",
          "airspace"
        ],
        [
          "transition altitude",
          "transition altitude"
        ],
        [
          "transition level",
          "transition level"
        ]
      ],
      "raw_glosses": [
        "(aviation) The airspace above the transition altitude but below the transition level."
      ],
      "tags": [
        "uncountable",
        "usually"
      ],
      "topics": [
        "aeronautics",
        "aerospace",
        "aviation",
        "business",
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "transition layer"
}