"خمسين" meaning in Arabic

{
  "forms": [
    {
      "form": "خَمْسِينَ",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "ḵamsīna",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ar",
        "2": "numeral form",
        "head": "خَمْسِينَ"
      },
      "expansion": "خَمْسِينَ • (ḵamsīna)",
      "name": "head"
    }
  ],
  "lang": "Arabic",
  "lang_code": "ar",
  "pos": "num",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Arabic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 4 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "ḵamsūna",
          "word": "خَمْسُونَ"
        }
      ],
      "glosses": [
        "genitive/accusative of خَمْسُونَ (ḵamsūna)"
      ],
      "id": "en-خمسين-ar-num-LdDSjB5f",
      "links": [
        [
          "خَمْسُونَ",
          "خمسون#Arabic"
        ]
      ],
      "tags": [
        "accusative",
        "form-of",
        "genitive"
      ]
    }
  ],
  "word": "خمسين"
}

{
  "forms": [
    {
      "form": "خَمْسِينَ",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "ḵamsīna",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ar",
        "2": "numeral form",
        "head": "خَمْسِينَ"
      },
      "expansion": "خَمْسِينَ • (ḵamsīna)",
      "name": "head"
    }
  ],
  "lang": "Arabic",
  "lang_code": "ar",
  "pos": "num",
  "senses": [
    {
      "categories": [
        "Arabic entries with incorrect language header",
        "Arabic non-lemma forms",
        "Arabic numeral forms",
        "Pages with 4 entries",
        "Pages with entries"
      ],
      "form_of": [
        {
          "extra": "ḵamsūna",
          "word": "خَمْسُونَ"
        }
      ],
      "glosses": [
        "genitive/accusative of خَمْسُونَ (ḵamsūna)"
      ],
      "links": [
        [
          "خَمْسُونَ",
          "خمسون#Arabic"
        ]
      ],
      "tags": [
        "accusative",
        "form-of",
        "genitive"
      ]
    }
  ],
  "word": "خمسين"
}