"sentential calculus" meaning in English

{
  "forms": [
    {
      "form": "sentential calculi",
      "tags": [
        "plural"
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        "2": "sentential calculi"
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      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "name": "English entries with incorrect language header",
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          "source": "w"
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      ],
      "glosses": [
        "Synonym of propositional calculus"
      ],
      "id": "en-sentential_calculus-en-noun-3lQgdsA2",
      "links": [
        [
          "propositional calculus",
          "propositional calculus#English"
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          "word": "propositional calculus"
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      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "sentential calculus"
}

{
  "forms": [
    {
      "form": "sentential calculi",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
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        "2": "sentential calculi"
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      "expansion": "sentential calculus (countable and uncountable, plural sentential calculi)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "English entries with incorrect language header",
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      ],
      "glosses": [
        "Synonym of propositional calculus"
      ],
      "links": [
        [
          "propositional calculus",
          "propositional calculus#English"
        ]
      ],
      "synonyms": [
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          "word": "propositional calculus"
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  ],
  "word": "sentential calculus"
}