"fourth grader" meaning in English

{
  "forms": [
    {
      "form": "fourth graders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "fourth grader (plural fourth graders)",
      "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": "topical",
          "langcode": "en",
          "name": "Education",
          "orig": "en:Education",
          "parents": [
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "People",
          "orig": "en:People",
          "parents": [
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "first grader"
        },
        {
          "word": "second grader"
        },
        {
          "word": "third grader"
        },
        {
          "word": "fifth grader"
        },
        {
          "word": "sixth grader"
        },
        {
          "word": "seventh grader"
        },
        {
          "word": "eighth grader"
        },
        {
          "word": "ninth grader"
        },
        {
          "word": "tenth grader"
        },
        {
          "word": "eleventh grader"
        },
        {
          "word": "twelfth grader"
        },
        {
          "word": "thirteenth grader"
        }
      ],
      "glosses": [
        "A pupil who is in fourth grade."
      ],
      "hyponyms": [
        {
          "word": "gradeschooler"
        }
      ],
      "id": "en-fourth_grader-en-noun-yGZ1g0mL",
      "links": [
        [
          "education",
          "education"
        ],
        [
          "pupil",
          "pupil"
        ],
        [
          "fourth grade",
          "fourth grade"
        ]
      ],
      "raw_glosses": [
        "(US, education) A pupil who is in fourth grade."
      ],
      "synonyms": [
        {
          "tags": [
            "Canada"
          ],
          "word": "grade fourer"
        },
        {
          "word": "4th grader"
        },
        {
          "word": "4th-grader"
        },
        {
          "word": "fourth-grader"
        }
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "education"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "pupil in 4th grade",
          "word": "neljäsluokkalainen"
        }
      ]
    }
  ],
  "word": "fourth grader"
}

{
  "coordinate_terms": [
    {
      "word": "first grader"
    },
    {
      "word": "second grader"
    },
    {
      "word": "third grader"
    },
    {
      "word": "fifth grader"
    },
    {
      "word": "sixth grader"
    },
    {
      "word": "seventh grader"
    },
    {
      "word": "eighth grader"
    },
    {
      "word": "ninth grader"
    },
    {
      "word": "tenth grader"
    },
    {
      "word": "eleventh grader"
    },
    {
      "word": "twelfth grader"
    },
    {
      "word": "thirteenth grader"
    }
  ],
  "forms": [
    {
      "form": "fourth graders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "fourth grader (plural fourth graders)",
      "name": "en-noun"
    }
  ],
  "hyponyms": [
    {
      "word": "gradeschooler"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Education",
        "en:People"
      ],
      "glosses": [
        "A pupil who is in fourth grade."
      ],
      "links": [
        [
          "education",
          "education"
        ],
        [
          "pupil",
          "pupil"
        ],
        [
          "fourth grade",
          "fourth grade"
        ]
      ],
      "raw_glosses": [
        "(US, education) A pupil who is in fourth grade."
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "education"
      ]
    }
  ],
  "synonyms": [
    {
      "tags": [
        "Canada"
      ],
      "word": "grade fourer"
    },
    {
      "word": "4th grader"
    },
    {
      "word": "4th-grader"
    },
    {
      "word": "fourth-grader"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "pupil in 4th grade",
      "word": "neljäsluokkalainen"
    }
  ],
  "word": "fourth grader"
}