"1st grader" meaning in English

{
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    {
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        "2": "1st grade",
        "3": "er",
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      "expansion": "1st grade + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "1st grade + -er",
  "forms": [
    {
      "form": "1st graders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "1st grader (plural 1st graders)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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      "alt_of": [
        {
          "word": "first grader"
        }
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      "categories": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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          "name": "English terms suffixed with -er (measurement)",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Education",
          "orig": "en:Education",
          "parents": [
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Alternative spelling of first grader"
      ],
      "id": "en-1st_grader-en-noun-Mv-ADC4f",
      "links": [
        [
          "first grader",
          "first grader#English"
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      "tags": [
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    }
  ],
  "word": "1st grader"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "1st grade",
        "3": "er",
        "id2": "measurement"
      },
      "expansion": "1st grade + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "1st grade + -er",
  "forms": [
    {
      "form": "1st graders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "1st grader (plural 1st graders)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "word": "first grader"
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        "en:Education"
      ],
      "glosses": [
        "Alternative spelling of first grader"
      ],
      "links": [
        [
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      "tags": [
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  ],
  "word": "1st grader"
}