"opter" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "opt",
        "3": "er"
      },
      "expansion": "opt + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "From opt + -er.",
  "forms": [
    {
      "form": "opters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "opter (plural opters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -er",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2012, Jeff Sellars, Light Shining in a Dark Place, page 50:",
          "text": "Hannibal Lecter is one of many in the gallery of cinema villains and unrepentant opters for evil who remind us that the only place where they will be at home is Hell or the void.",
          "type": "quote"
        }
      ],
      "glosses": [
        "One who opts, or makes a choice."
      ],
      "id": "en-opter-en-noun-pQXe26s2",
      "links": [
        [
          "opt",
          "opt"
        ]
      ]
    }
  ],
  "word": "opter"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "opt",
        "3": "er"
      },
      "expansion": "opt + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "From opt + -er.",
  "forms": [
    {
      "form": "opters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "opter (plural opters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms suffixed with -er",
        "English terms with quotations",
        "Pages with 3 entries",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2012, Jeff Sellars, Light Shining in a Dark Place, page 50:",
          "text": "Hannibal Lecter is one of many in the gallery of cinema villains and unrepentant opters for evil who remind us that the only place where they will be at home is Hell or the void.",
          "type": "quote"
        }
      ],
      "glosses": [
        "One who opts, or makes a choice."
      ],
      "links": [
        [
          "opt",
          "opt"
        ]
      ]
    }
  ],
  "word": "opter"
}