"opt-in" meaning in English

{
  "antonyms": [
    {
      "word": "opt-out"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "opt",
        "3": "in"
      },
      "expansion": "opt + in",
      "name": "compound"
    }
  ],
  "etymology_text": "From opt + in.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "opt-in (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "double opt-in"
        }
      ],
      "examples": [
        {
          "text": "They set up an opt-in mailing list, so that those who wanted the notices could subscribe."
        }
      ],
      "glosses": [
        "The property of having to choose explicitly to join or permit something; a decision having the default option being exclusion or avoidance; used particularly with regard to mailing lists and advertising."
      ],
      "id": "en-opt-in-en-adj-tmIn-F5-",
      "links": [
        [
          "join",
          "join"
        ],
        [
          "permit",
          "permit"
        ],
        [
          "default",
          "default"
        ],
        [
          "exclusion",
          "exclusion"
        ],
        [
          "avoidance",
          "avoidance"
        ]
      ],
      "tags": [
        "not-comparable"
      ],
      "translations": [
        {
          "code": "de",
          "lang": "German",
          "sense": "1. The property of having to choose explicitly to join or permit something",
          "word": "unter vorhergehender Einwilligung"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "1. The property of having to choose explicitly to join or permit something",
          "word": "vorhergehende Einwilligung erfordernd"
        },
        {
          "code": "de",
          "lang": "German",
          "note": "vorherige, ausdrückliche Zustimmung benötigend",
          "sense": "1. The property of having to choose explicitly to join or permit something"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "sense": "1. The property of having to choose explicitly to join or permit something",
          "tags": [
            "feminine"
          ],
          "word": "de adhesión"
        }
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-us-opt-in.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/e/e0/En-us-opt-in.ogg/En-us-opt-in.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/e/e0/En-us-opt-in.ogg",
      "tags": [
        "Mid-Atlantic"
      ],
      "text": "Audio (Mid-Atlantic)"
    }
  ],
  "word": "opt-in"
}

{
  "antonyms": [
    {
      "word": "opt-out"
    }
  ],
  "derived": [
    {
      "word": "double opt-in"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "opt",
        "3": "in"
      },
      "expansion": "opt + in",
      "name": "compound"
    }
  ],
  "etymology_text": "From opt + in.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "opt-in (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English compound terms",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English terms with audio links",
        "English uncomparable adjectives"
      ],
      "examples": [
        {
          "text": "They set up an opt-in mailing list, so that those who wanted the notices could subscribe."
        }
      ],
      "glosses": [
        "The property of having to choose explicitly to join or permit something; a decision having the default option being exclusion or avoidance; used particularly with regard to mailing lists and advertising."
      ],
      "links": [
        [
          "join",
          "join"
        ],
        [
          "permit",
          "permit"
        ],
        [
          "default",
          "default"
        ],
        [
          "exclusion",
          "exclusion"
        ],
        [
          "avoidance",
          "avoidance"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-us-opt-in.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/e/e0/En-us-opt-in.ogg/En-us-opt-in.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/e/e0/En-us-opt-in.ogg",
      "tags": [
        "Mid-Atlantic"
      ],
      "text": "Audio (Mid-Atlantic)"
    }
  ],
  "translations": [
    {
      "code": "de",
      "lang": "German",
      "sense": "1. The property of having to choose explicitly to join or permit something",
      "word": "unter vorhergehender Einwilligung"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "1. The property of having to choose explicitly to join or permit something",
      "word": "vorhergehende Einwilligung erfordernd"
    },
    {
      "code": "de",
      "lang": "German",
      "note": "vorherige, ausdrückliche Zustimmung benötigend",
      "sense": "1. The property of having to choose explicitly to join or permit something"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "1. The property of having to choose explicitly to join or permit something",
      "tags": [
        "feminine"
      ],
      "word": "de adhesión"
    }
  ],
  "word": "opt-in"
}

{
  "called_from": "translations/609-20230504",
  "msg": "Translation too long compared to word, so it is skipped",
  "path": [
    "opt-in"
  ],
  "section": "English",
  "subsection": "adjective",
  "title": "opt-in",
  "trace": ""
}