"have reason" meaning in English

{
  "derived": [
    {
      "_dis1": "0 100",
      "word": "have reason to believe"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "frm",
        "3": "avoir raison"
      },
      "expansion": "Middle French avoir raison",
      "name": "uder"
    }
  ],
  "etymology_text": "From have + reason, partly after Middle French avoir raison.",
  "forms": [
    {
      "form": "has reason",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "having reason",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "had reason",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "had reason",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "have<has,,had> reason"
      },
      "expansion": "have reason (third-person singular simple present has reason, present participle having reason, simple past and past participle had reason)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [],
      "examples": [
        {
          "ref": "1603, Michel de Montaigne, chapter 56, in John Florio, transl., The Essayes […], book I, London: […] Val[entine] Simmes for Edward Blount […], →OCLC:",
          "text": "They would have no man use it as an interjection or exclamation, not to be alleaged as a witnesse or comparison, wherein I find they have reason.",
          "type": "quote"
        }
      ],
      "glosses": [
        "To be right."
      ],
      "id": "en-have_reason-en-verb-ieEkH8WS",
      "links": [
        [
          "right",
          "right"
        ]
      ],
      "raw_glosses": [
        "(obsolete) To be right."
      ],
      "tags": [
        "obsolete"
      ]
    },
    {
      "categories": [
        {
          "_dis": "18 82",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "17 83",
          "kind": "other",
          "name": "English undefined derivations",
          "parents": [
            "Undefined derivations",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "20 80",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "14 86",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "2008 December 12, Martin Kettle, The Guardian:",
          "text": "The finance minister had reason to be exasperated. Britain's economic future hinges on Europe, and this is no time for animus.",
          "type": "quote"
        }
      ],
      "glosses": [
        "To have grounds, justification etc. (to do something, or for something)."
      ],
      "id": "en-have_reason-en-verb-Aea2m27g",
      "links": [
        [
          "grounds",
          "grounds"
        ],
        [
          "justification",
          "justification"
        ],
        [
          "to",
          "to#English"
        ],
        [
          "for",
          "for#English"
        ]
      ]
    }
  ],
  "word": "have reason"
}

{
  "categories": [
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English terms derived from Middle French",
    "English undefined derivations",
    "English verbs",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "derived": [
    {
      "word": "have reason to believe"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "frm",
        "3": "avoir raison"
      },
      "expansion": "Middle French avoir raison",
      "name": "uder"
    }
  ],
  "etymology_text": "From have + reason, partly after Middle French avoir raison.",
  "forms": [
    {
      "form": "has reason",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "having reason",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "had reason",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "had reason",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "have<has,,had> reason"
      },
      "expansion": "have reason (third-person singular simple present has reason, present participle having reason, simple past and past participle had reason)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English terms with obsolete senses",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1603, Michel de Montaigne, chapter 56, in John Florio, transl., The Essayes […], book I, London: […] Val[entine] Simmes for Edward Blount […], →OCLC:",
          "text": "They would have no man use it as an interjection or exclamation, not to be alleaged as a witnesse or comparison, wherein I find they have reason.",
          "type": "quote"
        }
      ],
      "glosses": [
        "To be right."
      ],
      "links": [
        [
          "right",
          "right"
        ]
      ],
      "raw_glosses": [
        "(obsolete) To be right."
      ],
      "tags": [
        "obsolete"
      ]
    },
    {
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2008 December 12, Martin Kettle, The Guardian:",
          "text": "The finance minister had reason to be exasperated. Britain's economic future hinges on Europe, and this is no time for animus.",
          "type": "quote"
        }
      ],
      "glosses": [
        "To have grounds, justification etc. (to do something, or for something)."
      ],
      "links": [
        [
          "grounds",
          "grounds"
        ],
        [
          "justification",
          "justification"
        ],
        [
          "to",
          "to#English"
        ],
        [
          "for",
          "for#English"
        ]
      ]
    }
  ],
  "word": "have reason"
}