"equational class" meaning in English

{
  "forms": [
    {
      "form": "equational classes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "equational class (plural equational classes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
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        {
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          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Algebra",
          "orig": "en:Algebra",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Synonym of variety (“an equational class in universal algebra”)."
      ],
      "id": "en-equational_class-en-noun-HXgCaoyO",
      "links": [
        [
          "algebra",
          "algebra"
        ],
        [
          "variety",
          "variety#English"
        ]
      ],
      "raw_glosses": [
        "(algebra) Synonym of variety (“an equational class in universal algebra”)."
      ],
      "synonyms": [
        {
          "extra": "an equational class in universal algebra",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "variety"
        }
      ],
      "topics": [
        "algebra",
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "equational class"
}

{
  "forms": [
    {
      "form": "equational classes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "equational class (plural equational classes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
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        "Pages with entries",
        "en:Algebra"
      ],
      "glosses": [
        "Synonym of variety (“an equational class in universal algebra”)."
      ],
      "links": [
        [
          "algebra",
          "algebra"
        ],
        [
          "variety",
          "variety#English"
        ]
      ],
      "raw_glosses": [
        "(algebra) Synonym of variety (“an equational class in universal algebra”)."
      ],
      "synonyms": [
        {
          "extra": "an equational class in universal algebra",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "variety"
        }
      ],
      "topics": [
        "algebra",
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "equational class"
}