"مسائية" meaning in Arabic

{
  "forms": [
    {
      "form": "مَسَائِيَّة",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "masāʔiyya",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "مَسَائِيَّة"
      },
      "expansion": "مَسَائِيَّة • (masāʔiyya)",
      "name": "ar-adj"
    }
  ],
  "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": "masāʔiyy",
          "word": "مَسَائِيّ"
        }
      ],
      "glosses": [
        "feminine singular of مَسَائِيّ (masāʔiyy)"
      ],
      "id": "en-مسائية-ar-adj-7MrDdygo",
      "links": [
        [
          "مَسَائِيّ",
          "مسائي#Arabic"
        ]
      ],
      "tags": [
        "feminine",
        "form-of",
        "singular"
      ]
    }
  ],
  "word": "مسائية"
}

{
  "forms": [
    {
      "form": "مَسَائِيَّة",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "masāʔiyya",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "مَسَائِيَّة"
      },
      "expansion": "مَسَائِيَّة • (masāʔiyya)",
      "name": "ar-adj"
    }
  ],
  "lang": "Arabic",
  "lang_code": "ar",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Arabic adjectives",
        "Arabic entries with incorrect language header",
        "Arabic lemmas",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "form_of": [
        {
          "extra": "masāʔiyy",
          "word": "مَسَائِيّ"
        }
      ],
      "glosses": [
        "feminine singular of مَسَائِيّ (masāʔiyy)"
      ],
      "links": [
        [
          "مَسَائِيّ",
          "مسائي#Arabic"
        ]
      ],
      "tags": [
        "feminine",
        "form-of",
        "singular"
      ]
    }
  ],
  "word": "مسائية"
}