"master seaman" meaning in English

{
  "forms": [
    {
      "form": "master seamen",
      "tags": [
        "plural"
      ]
    }
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  "head_templates": [
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        "1": "master seamen"
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      "expansion": "master seaman (plural master seamen)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Canadian English",
          "parents": [],
          "source": "w"
        },
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Military ranks",
          "orig": "en:Military ranks",
          "parents": [
            "Military",
            "Positions of authority",
            "Titles",
            "Society",
            "Leaders",
            "Occupations",
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            "Fundamental",
            "Human activity",
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          "kind": "topical",
          "langcode": "en",
          "name": "People",
          "orig": "en:People",
          "parents": [
            "Human",
            "All topics",
            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "A non-commissioned officer in the Canadian Forces Maritime Command, ranking above leading seaman and below petty officer second class."
      ],
      "id": "en-master_seaman-en-noun-yAuydhLZ",
      "links": [
        [
          "non-commissioned officer",
          "non-commissioned officer"
        ],
        [
          "leading seaman",
          "leading seaman"
        ],
        [
          "petty officer second class",
          "petty officer second class"
        ]
      ],
      "raw_glosses": [
        "(Canada, Navy) A non-commissioned officer in the Canadian Forces Maritime Command, ranking above leading seaman and below petty officer second class."
      ],
      "tags": [
        "Canada",
        "Navy"
      ],
      "wikipedia": [
        "master seaman"
      ]
    }
  ],
  "word": "master seaman"
}

{
  "forms": [
    {
      "form": "master seamen",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
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      "expansion": "master seaman (plural master seamen)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Canadian English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
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        "en:Military ranks",
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      ],
      "glosses": [
        "A non-commissioned officer in the Canadian Forces Maritime Command, ranking above leading seaman and below petty officer second class."
      ],
      "links": [
        [
          "non-commissioned officer",
          "non-commissioned officer"
        ],
        [
          "leading seaman",
          "leading seaman"
        ],
        [
          "petty officer second class",
          "petty officer second class"
        ]
      ],
      "raw_glosses": [
        "(Canada, Navy) A non-commissioned officer in the Canadian Forces Maritime Command, ranking above leading seaman and below petty officer second class."
      ],
      "tags": [
        "Canada",
        "Navy"
      ],
      "wikipedia": [
        "master seaman"
      ]
    }
  ],
  "word": "master seaman"
}