"تحتانية" meaning in Arabic

{
  "forms": [
    {
      "form": "تَحْتَانِيَّة",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "taḥtāniyya",
      "tags": [
        "romanization"
      ]
    }
  ],
  "lang": "Arabic",
  "lang_code": "ar",
  "pos": "adj",
  "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 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "taḥtāniyy",
          "word": "تَحْتَانِيّ"
        }
      ],
      "glosses": [
        "feminine singular of تَحْتَانِيّ (taḥtāniyy)"
      ],
      "id": "en-تحتانية-ar-adj-YUnU20dk",
      "links": [
        [
          "تَحْتَانِيّ",
          "تحتاني#Arabic"
        ]
      ],
      "tags": [
        "feminine",
        "form-of",
        "singular"
      ]
    }
  ],
  "word": "تحتانية"
}

{
  "forms": [
    {
      "form": "تَحْتَانِيَّة",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "taḥtāniyya",
      "tags": [
        "romanization"
      ]
    }
  ],
  "lang": "Arabic",
  "lang_code": "ar",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Arabic adjective feminine forms",
        "Arabic entries with incorrect language header",
        "Arabic non-lemma forms",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "form_of": [
        {
          "extra": "taḥtāniyy",
          "word": "تَحْتَانِيّ"
        }
      ],
      "glosses": [
        "feminine singular of تَحْتَانِيّ (taḥtāniyy)"
      ],
      "links": [
        [
          "تَحْتَانِيّ",
          "تحتاني#Arabic"
        ]
      ],
      "tags": [
        "feminine",
        "form-of",
        "singular"
      ]
    }
  ],
  "word": "تحتانية"
}