"bestseller" meaning in English

{
  "forms": [
    {
      "form": "bestseller",
      "tags": [
        "singular"
      ]
    },
    {
      "form": "bestsellers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "expansion": "[POS TABLE]",
      "name": "noun"
    }
  ],
  "hyphenation": "best‧sell‧er",
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [],
      "examples": [
        {
          "text": "The hula hoop was a bestseller in the late 1950s."
        },
        {
          "text": "The James Bond books are bestsellers."
        },
        {
          "text": "Have you read any bestsellers this month?"
        }
      ],
      "glosses": [
        "A bestseller is a book or any other product that has sold in large numbers."
      ],
      "id": "simple-bestseller-en-noun-9JE4kzvf",
      "raw_tags": [
        "countable"
      ]
    }
  ],
  "word": "bestseller"
}

{
  "forms": [
    {
      "form": "bestseller",
      "tags": [
        "singular"
      ]
    },
    {
      "form": "bestsellers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "expansion": "[POS TABLE]",
      "name": "noun"
    }
  ],
  "hyphenation": "best‧sell‧er",
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Countable nouns"
      ],
      "examples": [
        {
          "text": "The hula hoop was a bestseller in the late 1950s."
        },
        {
          "text": "The James Bond books are bestsellers."
        },
        {
          "text": "Have you read any bestsellers this month?"
        }
      ],
      "glosses": [
        "A bestseller is a book or any other product that has sold in large numbers."
      ],
      "raw_tags": [
        "countable"
      ]
    }
  ],
  "word": "bestseller"
}