"at pleasure" meaning in English

{
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              7,
              18
            ]
          ],
          "ref": "1670, John Dryden, The Conquest of Granada:",
          "text": "I will at pleasure now revenge my wrong; And, Traytor, thou shalt feel my vengeance long",
          "type": "quotation"
        }
      ],
      "glosses": [
        "By arbitrary will or choice."
      ],
      "id": "en-at_pleasure-en-prep_phrase-q57TaxVs"
    }
  ],
  "word": "at pleasure"
}

{
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English prepositional phrases",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              7,
              18
            ]
          ],
          "ref": "1670, John Dryden, The Conquest of Granada:",
          "text": "I will at pleasure now revenge my wrong; And, Traytor, thou shalt feel my vengeance long",
          "type": "quotation"
        }
      ],
      "glosses": [
        "By arbitrary will or choice."
      ]
    }
  ],
  "word": "at pleasure"
}