"اثنينئذ" meaning in Arabic

{
  "forms": [
    {
      "form": "اِثْنَيْنَئِذٍ",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "iṯnaynaʔiḏin",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "اِثْنَيْنَئِذٍ"
      },
      "expansion": "اِثْنَيْنَئِذٍ • (iṯnaynaʔiḏin)",
      "name": "ar-adv"
    }
  ],
  "lang": "Arabic",
  "lang_code": "ar",
  "pos": "adv",
  "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"
        },
        {
          "kind": "topical",
          "langcode": "ar",
          "name": "Time",
          "orig": "ar:Time",
          "parents": [
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "at that Monday"
      ],
      "id": "en-اثنينئذ-ar-adv-RgG1pI6H"
    }
  ],
  "word": "اثنينئذ"
}

{
  "forms": [
    {
      "form": "اِثْنَيْنَئِذٍ",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "iṯnaynaʔiḏin",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "اِثْنَيْنَئِذٍ"
      },
      "expansion": "اِثْنَيْنَئِذٍ • (iṯnaynaʔiḏin)",
      "name": "ar-adv"
    }
  ],
  "lang": "Arabic",
  "lang_code": "ar",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "Arabic adverbs",
        "Arabic demonstrative adverbs",
        "Arabic entries with incorrect language header",
        "Arabic lemmas",
        "Arabic time adverbs",
        "Pages with 1 entry",
        "Pages with entries",
        "ar:Time"
      ],
      "glosses": [
        "at that Monday"
      ]
    }
  ],
  "word": "اثنينئذ"
}