"transition level" meaning in English

{
  "forms": [
    {
      "form": "transition levels",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "2": "+"
      },
      "expansion": "transition level (usually uncountable, plural transition levels)",
      "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"
        }
      ],
      "coordinate_terms": [
        {
          "word": "transition altitude"
        }
      ],
      "glosses": [
        "The lowest flight level above the transition altitude; depends on the transition altitude and the measured or calculated sea-level atmospheric pressure. The flight level at which a descending aircraft's barometric altimeters are reset from a constant setting of 1013.25 hectopascals to the setting corresponding to the actual measured or calculated atmospheric pressure at mean sea level."
      ],
      "id": "en-transition_level-en-noun-fCen4gGq",
      "links": [
        [
          "aviation",
          "aviation"
        ],
        [
          "flight level",
          "flight level"
        ],
        [
          "transition altitude",
          "transition altitude"
        ],
        [
          "sea-level",
          "sea level"
        ],
        [
          "atmospheric",
          "atmospheric"
        ],
        [
          "pressure",
          "pressure"
        ],
        [
          "descending",
          "descending"
        ],
        [
          "aircraft",
          "aircraft"
        ],
        [
          "barometric",
          "barometric"
        ],
        [
          "altimeter",
          "altimeter"
        ],
        [
          "hectopascal",
          "hectopascal"
        ],
        [
          "mean sea level",
          "mean sea level"
        ]
      ],
      "raw_glosses": [
        "(aviation) The lowest flight level above the transition altitude; depends on the transition altitude and the measured or calculated sea-level atmospheric pressure. The flight level at which a descending aircraft's barometric altimeters are reset from a constant setting of 1013.25 hectopascals to the setting corresponding to the actual measured or calculated atmospheric pressure at mean sea level."
      ],
      "related": [
        {
          "word": "transition layer"
        }
      ],
      "tags": [
        "uncountable",
        "usually"
      ],
      "topics": [
        "aeronautics",
        "aerospace",
        "aviation",
        "business",
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "transition level"
}

{
  "coordinate_terms": [
    {
      "word": "transition altitude"
    }
  ],
  "forms": [
    {
      "form": "transition levels",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "2": "+"
      },
      "expansion": "transition level (usually uncountable, plural transition levels)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "transition layer"
    }
  ],
  "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 lowest flight level above the transition altitude; depends on the transition altitude and the measured or calculated sea-level atmospheric pressure. The flight level at which a descending aircraft's barometric altimeters are reset from a constant setting of 1013.25 hectopascals to the setting corresponding to the actual measured or calculated atmospheric pressure at mean sea level."
      ],
      "links": [
        [
          "aviation",
          "aviation"
        ],
        [
          "flight level",
          "flight level"
        ],
        [
          "transition altitude",
          "transition altitude"
        ],
        [
          "sea-level",
          "sea level"
        ],
        [
          "atmospheric",
          "atmospheric"
        ],
        [
          "pressure",
          "pressure"
        ],
        [
          "descending",
          "descending"
        ],
        [
          "aircraft",
          "aircraft"
        ],
        [
          "barometric",
          "barometric"
        ],
        [
          "altimeter",
          "altimeter"
        ],
        [
          "hectopascal",
          "hectopascal"
        ],
        [
          "mean sea level",
          "mean sea level"
        ]
      ],
      "raw_glosses": [
        "(aviation) The lowest flight level above the transition altitude; depends on the transition altitude and the measured or calculated sea-level atmospheric pressure. The flight level at which a descending aircraft's barometric altimeters are reset from a constant setting of 1013.25 hectopascals to the setting corresponding to the actual measured or calculated atmospheric pressure at mean sea level."
      ],
      "tags": [
        "uncountable",
        "usually"
      ],
      "topics": [
        "aeronautics",
        "aerospace",
        "aviation",
        "business",
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "transition level"
}