"in theory" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase"
      },
      "expansion": "in theory",
      "name": "head"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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          "name": "English entries with language name categories using raw markup",
          "parents": [
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          "source": "w"
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          "name": "English hedges",
          "parents": [],
          "source": "w"
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          "parents": [
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          "source": "w"
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      ],
      "examples": [
        {
          "text": "That sounds fine in theory, but will it work in practice?"
        }
      ],
      "glosses": [
        "Theoretically."
      ],
      "id": "en-in_theory-en-prep_phrase-tWr7r188",
      "links": [
        [
          "Theoretically",
          "theoretically"
        ]
      ],
      "related": [
        {
          "word": "in fact"
        },
        {
          "word": "in practice"
        },
        {
          "word": "in principle"
        },
        {
          "word": "in reality"
        },
        {
          "word": "on paper"
        }
      ],
      "translations": [
        {
          "code": "eo",
          "lang": "Esperanto",
          "sense": "Translations",
          "word": "teorie"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "Translations",
          "word": "w teorii"
        }
      ]
    }
  ],
  "word": "in theory"
}

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase"
      },
      "expansion": "in theory",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "related": [
    {
      "word": "in fact"
    },
    {
      "word": "in practice"
    },
    {
      "word": "in principle"
    },
    {
      "word": "in reality"
    },
    {
      "word": "on paper"
    }
  ],
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        "English entries with language name categories using raw markup",
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        "English prepositional phrases",
        "English terms with non-redundant non-automated sortkeys",
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      ],
      "examples": [
        {
          "text": "That sounds fine in theory, but will it work in practice?"
        }
      ],
      "glosses": [
        "Theoretically."
      ],
      "links": [
        [
          "Theoretically",
          "theoretically"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "eo",
      "lang": "Esperanto",
      "sense": "Translations",
      "word": "teorie"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "Translations",
      "word": "w teorii"
    }
  ],
  "word": "in theory"
}