"matelot de première classe" meaning in Français

{
  "abbreviation": [
    {
      "word": "mat 1"
    }
  ],
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions nominales en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Traductions en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Motcomposé de matelot, de, première et classe."
  ],
  "forms": [
    {
      "form": "matelots de première classe",
      "tags": [
        "plural",
        "masculine",
        "feminine"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en français du militaire",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en français",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Français du Canada",
          "orig": "français du Canada",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Grade de la Marine royale canadienne."
      ],
      "id": "fr-matelot_de_première_classe-fr-noun-Y1bsku5r",
      "raw_tags": [
        "Canada"
      ],
      "topics": [
        "military"
      ]
    }
  ],
  "tags": [
    "feminine",
    "masculine"
  ],
  "translations": [
    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "leading seaman"
    }
  ],
  "word": "matelot de première classe"
}

{
  "abbreviation": [
    {
      "word": "mat 1"
    }
  ],
  "categories": [
    "Compositions en français",
    "Locutions nominales en français",
    "Traductions en anglais",
    "français"
  ],
  "etymology_texts": [
    "Motcomposé de matelot, de, première et classe."
  ],
  "forms": [
    {
      "form": "matelots de première classe",
      "tags": [
        "plural",
        "masculine",
        "feminine"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        "Lexique en français du militaire",
        "Wiktionnaire:Exemples manquants en français",
        "français du Canada"
      ],
      "glosses": [
        "Grade de la Marine royale canadienne."
      ],
      "raw_tags": [
        "Canada"
      ],
      "topics": [
        "military"
      ]
    }
  ],
  "tags": [
    "feminine",
    "masculine"
  ],
  "translations": [
    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "leading seaman"
    }
  ],
  "word": "matelot de première classe"
}