"air line" meaning in English

{
  "forms": [
    {
      "form": "air lines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "air line (plural air lines)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "46 54",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A pipe or tube supplying air or compressed air."
      ],
      "id": "en-air_line-en-noun-aQOOBkmM",
      "links": [
        [
          "pipe",
          "pipe"
        ],
        [
          "tube",
          "tube"
        ],
        [
          "air",
          "air"
        ],
        [
          "compressed air",
          "compressed air"
        ]
      ],
      "translations": [
        {
          "_dis1": "68 32",
          "code": "el",
          "lang": "Greek",
          "roman": "aerosolínas",
          "sense": "air supply",
          "tags": [
            "masculine"
          ],
          "word": "αεροσωλήνας"
        }
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "46 54",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A railroad following a very flat, straight route between two endpoints in order to minimize travel times, choosing the shortest, most direct route practical even if an easier, cheaper (but longer) route was available."
      ],
      "id": "en-air_line-en-noun-6w4PM9El",
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "railroad",
          "railroad"
        ],
        [
          "endpoint",
          "endpoint"
        ]
      ],
      "raw_glosses": [
        "(rail transport) A railroad following a very flat, straight route between two endpoints in order to minimize travel times, choosing the shortest, most direct route practical even if an easier, cheaper (but longer) route was available."
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "wikipedia": [
    "air line",
    "air-line railroad"
  ],
  "word": "air line"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns"
  ],
  "forms": [
    {
      "form": "air lines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "air line (plural air lines)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A pipe or tube supplying air or compressed air."
      ],
      "links": [
        [
          "pipe",
          "pipe"
        ],
        [
          "tube",
          "tube"
        ],
        [
          "air",
          "air"
        ],
        [
          "compressed air",
          "compressed air"
        ]
      ]
    },
    {
      "categories": [
        "en:Rail transportation"
      ],
      "glosses": [
        "A railroad following a very flat, straight route between two endpoints in order to minimize travel times, choosing the shortest, most direct route practical even if an easier, cheaper (but longer) route was available."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "railroad",
          "railroad"
        ],
        [
          "endpoint",
          "endpoint"
        ]
      ],
      "raw_glosses": [
        "(rail transport) A railroad following a very flat, straight route between two endpoints in order to minimize travel times, choosing the shortest, most direct route practical even if an easier, cheaper (but longer) route was available."
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "translations": [
    {
      "code": "el",
      "lang": "Greek",
      "roman": "aerosolínas",
      "sense": "air supply",
      "tags": [
        "masculine"
      ],
      "word": "αεροσωλήνας"
    }
  ],
  "wikipedia": [
    "air line",
    "air-line railroad"
  ],
  "word": "air line"
}