"straight A's" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "straight A's pl (plural only)",
      "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 pluralia tantum",
          "parents": [
            "Pluralia tantum",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Education",
          "orig": "en:Education",
          "parents": [
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "He always gets straight A's; he must study a lot.",
          "type": "example"
        }
      ],
      "glosses": [
        "Grades or marks that are consistently A's."
      ],
      "id": "en-straight_A's-en-noun-NbACLQqI",
      "links": [
        [
          "education",
          "education"
        ],
        [
          "A",
          "a#en-noun-grade"
        ]
      ],
      "raw_glosses": [
        "(education, chiefly US) Grades or marks that are consistently A's."
      ],
      "related": [
        {
          "word": "straight A"
        }
      ],
      "tags": [
        "US",
        "plural",
        "plural-only"
      ],
      "topics": [
        "education"
      ]
    }
  ],
  "word": "straight A's"
}

{
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "straight A's pl (plural only)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "straight A"
    }
  ],
  "senses": [
    {
      "categories": [
        "American English",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English pluralia tantum",
        "English terms with usage examples",
        "en:Education"
      ],
      "examples": [
        {
          "text": "He always gets straight A's; he must study a lot.",
          "type": "example"
        }
      ],
      "glosses": [
        "Grades or marks that are consistently A's."
      ],
      "links": [
        [
          "education",
          "education"
        ],
        [
          "A",
          "a#en-noun-grade"
        ]
      ],
      "raw_glosses": [
        "(education, chiefly US) Grades or marks that are consistently A's."
      ],
      "tags": [
        "US",
        "plural",
        "plural-only"
      ],
      "topics": [
        "education"
      ]
    }
  ],
  "word": "straight A's"
}