"by extension" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions adverbiales en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de by et de extension."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "related": [
    {
      "word": "extension"
    }
  ],
  "senses": [
    {
      "glosses": [
        "Par extension."
      ],
      "id": "fr-by_extension-en-adv-wbl6pETv"
    }
  ],
  "word": "by extension"
}

{
  "categories": [
    "Compositions en anglais",
    "Locutions adverbiales en anglais",
    "anglais"
  ],
  "etymology_texts": [
    "Composé de by et de extension."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "related": [
    {
      "word": "extension"
    }
  ],
  "senses": [
    {
      "glosses": [
        "Par extension."
      ]
    }
  ],
  "word": "by extension"
}