"incidentally" meaning in English

{
  "categories": [
    {
      "kind": "other",
      "name": "Adverbs",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Terms suffixed with -ly",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "incidental",
        "2": "ly"
      },
      "expansion": "incidental + -ly",
      "name": "ety-suffix"
    }
  ],
  "etymology_text": "incidental + -ly",
  "forms": [
    {
      "form": "incidentally",
      "tags": [
        "positive"
      ]
    },
    {
      "form": "–",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "Superlative–"
    }
  ],
  "head_templates": [
    {
      "expansion": "[POS TABLE]",
      "name": "adverb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "examples": [
        {
          "text": "It's dark because the sun has gone down. Incidentally, we are getting another storm right now."
        }
      ],
      "glosses": [
        "You use incidentally to tell your listener that you want to say more, or to introduce a new topic."
      ],
      "id": "simple-incidentally-en-adv-jK7ysx6a",
      "synonyms": [
        {
          "word": "by the way"
        }
      ]
    }
  ],
  "word": "incidentally"
}

{
  "categories": [
    "Adverbs",
    "Terms suffixed with -ly"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "incidental",
        "2": "ly"
      },
      "expansion": "incidental + -ly",
      "name": "ety-suffix"
    }
  ],
  "etymology_text": "incidental + -ly",
  "forms": [
    {
      "form": "incidentally",
      "tags": [
        "positive"
      ]
    },
    {
      "form": "–",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "Superlative–"
    }
  ],
  "head_templates": [
    {
      "expansion": "[POS TABLE]",
      "name": "adverb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "examples": [
        {
          "text": "It's dark because the sun has gone down. Incidentally, we are getting another storm right now."
        }
      ],
      "glosses": [
        "You use incidentally to tell your listener that you want to say more, or to introduce a new topic."
      ],
      "synonyms": [
        {
          "word": "by the way"
        }
      ]
    }
  ],
  "word": "incidentally"
}