"grade eight" meaning in English

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  "head_templates": [
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      "args": {
        "1": "?"
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      "expansion": "grade eight",
      "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": "other",
          "name": "Philippine English",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Eighth grade."
      ],
      "id": "en-grade_eight-en-noun-vbdHJfMD",
      "links": [
        [
          "Eighth grade",
          "eighth grade"
        ]
      ],
      "raw_glosses": [
        "(Canada, Philippines) Eighth grade."
      ],
      "synonyms": [
        {
          "word": "G8"
        },
        {
          "tags": [
            "abbreviation"
          ],
          "word": "G-8"
        },
        {
          "word": "grade 8"
        }
      ],
      "tags": [
        "Canada",
        "Philippines"
      ]
    }
  ],
  "word": "grade eight"
}

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "grade eight",
      "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",
        "English nouns with unknown or uncertain plurals",
        "Pages with 1 entry",
        "Pages with entries",
        "Philippine English"
      ],
      "glosses": [
        "Eighth grade."
      ],
      "links": [
        [
          "Eighth grade",
          "eighth grade"
        ]
      ],
      "raw_glosses": [
        "(Canada, Philippines) Eighth grade."
      ],
      "tags": [
        "Canada",
        "Philippines"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "G8"
    },
    {
      "tags": [
        "abbreviation"
      ],
      "word": "G-8"
    },
    {
      "word": "grade 8"
    }
  ],
  "word": "grade eight"
}

{
  "called_from": "form_descriptions/1089",
  "msg": "suspicious unhandled suffix in English: 'grade 8', originally 'grade 8'",
  "path": [
    "grade eight"
  ],
  "section": "English",
  "subsection": "",
  "title": "grade eight",
  "trace": ""
}