"هجدهم" meaning in Persian

{
  "etymology_text": "From هجده (hejdah, “eighteen”) + م (-om, “-th (ordinal number suffix))”).",
  "forms": [
    {
      "form": "hejdahom",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "tr": "hejdahom"
      },
      "expansion": "هجدهم • (hejdahom)",
      "name": "fa-adj"
    }
  ],
  "lang": "Persian",
  "lang_code": "fa",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Persian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "name": "Persian ordinal numbers",
          "parents": [
            "Ordinal numbers",
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "eighteenth"
      ],
      "id": "en-هجدهم-fa-adj-fYSrnwt2",
      "links": [
        [
          "eighteenth",
          "eighteenth"
        ]
      ]
    }
  ],
  "word": "هجدهم"
}

{
  "etymology_text": "From هجده (hejdah, “eighteen”) + م (-om, “-th (ordinal number suffix))”).",
  "forms": [
    {
      "form": "hejdahom",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "tr": "hejdahom"
      },
      "expansion": "هجدهم • (hejdahom)",
      "name": "fa-adj"
    }
  ],
  "lang": "Persian",
  "lang_code": "fa",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Persian adjectives",
        "Persian entries with incorrect language header",
        "Persian lemmas",
        "Persian ordinal numbers"
      ],
      "glosses": [
        "eighteenth"
      ],
      "links": [
        [
          "eighteenth",
          "eighteenth"
        ]
      ]
    }
  ],
  "word": "هجدهم"
}