"upperclassman" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "upper",
        "3": "classman"
      },
      "expansion": "upper + classman",
      "name": "com"
    }
  ],
  "etymology_text": "upper + classman",
  "forms": [
    {
      "form": "upperclassmen",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "upperclassmen"
      },
      "expansion": "upperclassman (plural upperclassmen)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "People",
          "orig": "en:People",
          "parents": [
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A junior or senior student in a school or college."
      ],
      "id": "en-upperclassman-en-noun-ClwLELpp",
      "links": [
        [
          "junior",
          "junior"
        ],
        [
          "senior",
          "senior"
        ],
        [
          "student",
          "student"
        ],
        [
          "school",
          "school"
        ],
        [
          "college",
          "college"
        ]
      ],
      "raw_glosses": [
        "(US) A junior or senior student in a school or college."
      ],
      "related": [
        {
          "word": "upperclasswoman"
        },
        {
          "word": "freshman"
        },
        {
          "word": "freshwoman"
        },
        {
          "word": "lowerclassman"
        },
        {
          "word": "underclassman"
        },
        {
          "word": "underclasswoman"
        }
      ],
      "tags": [
        "US"
      ],
      "translations": [
        {
          "code": "nl",
          "lang": "Dutch",
          "sense": "a senior student in a school or college",
          "tags": [
            "feminine",
            "masculine"
          ],
          "word": "ouderejaars"
        },
        {
          "alt": "せんぱい",
          "code": "ja",
          "lang": "Japanese",
          "roman": "senpai",
          "sense": "a senior student in a school or college",
          "word": "先輩"
        },
        {
          "code": "ko",
          "lang": "Korean",
          "roman": "seonbae",
          "sense": "a senior student in a school or college",
          "word": "선배"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "staršeklássnik",
          "sense": "a senior student in a school or college",
          "tags": [
            "masculine"
          ],
          "word": "старшекла́ссник"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "staršeklássnica",
          "sense": "a senior student in a school or college",
          "tags": [
            "feminine"
          ],
          "word": "старшекла́ссница"
        }
      ]
    }
  ],
  "word": "upperclassman"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "upper",
        "3": "classman"
      },
      "expansion": "upper + classman",
      "name": "com"
    }
  ],
  "etymology_text": "upper + classman",
  "forms": [
    {
      "form": "upperclassmen",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "upperclassmen"
      },
      "expansion": "upperclassman (plural upperclassmen)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "upperclasswoman"
    },
    {
      "word": "freshman"
    },
    {
      "word": "freshwoman"
    },
    {
      "word": "lowerclassman"
    },
    {
      "word": "underclassman"
    },
    {
      "word": "underclasswoman"
    }
  ],
  "senses": [
    {
      "categories": [
        "American English",
        "English adjective-noun compound nouns",
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English nouns",
        "English nouns with irregular plurals",
        "en:People"
      ],
      "glosses": [
        "A junior or senior student in a school or college."
      ],
      "links": [
        [
          "junior",
          "junior"
        ],
        [
          "senior",
          "senior"
        ],
        [
          "student",
          "student"
        ],
        [
          "school",
          "school"
        ],
        [
          "college",
          "college"
        ]
      ],
      "raw_glosses": [
        "(US) A junior or senior student in a school or college."
      ],
      "tags": [
        "US"
      ]
    }
  ],
  "translations": [
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "a senior student in a school or college",
      "tags": [
        "feminine",
        "masculine"
      ],
      "word": "ouderejaars"
    },
    {
      "alt": "せんぱい",
      "code": "ja",
      "lang": "Japanese",
      "roman": "senpai",
      "sense": "a senior student in a school or college",
      "word": "先輩"
    },
    {
      "code": "ko",
      "lang": "Korean",
      "roman": "seonbae",
      "sense": "a senior student in a school or college",
      "word": "선배"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "staršeklássnik",
      "sense": "a senior student in a school or college",
      "tags": [
        "masculine"
      ],
      "word": "старшекла́ссник"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "staršeklássnica",
      "sense": "a senior student in a school or college",
      "tags": [
        "feminine"
      ],
      "word": "старшекла́ссница"
    }
  ],
  "word": "upperclassman"
}