"wa" meaning in Ladino

{
  "etymology_templates": [
    {
      "args": {
        "1": "lad",
        "2": "ary",
        "3": "ايوه",
        "tr": "iwa"
      },
      "expansion": "Moroccan Arabic ايوه (iwa)",
      "name": "bor"
    }
  ],
  "etymology_text": "Probably from Moroccan Arabic ايوه (iwa).",
  "head_templates": [
    {
      "args": {
        "1": "lad",
        "2": "interjection"
      },
      "expansion": "wa",
      "name": "head"
    }
  ],
  "lang": "Ladino",
  "lang_code": "lad",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Haketia",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Ladino entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 70 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "so (used to introduce a new conversation or topic)"
      ],
      "id": "en-wa-lad-intj-yK90lKj8",
      "links": [
        [
          "so",
          "so"
        ]
      ],
      "raw_glosses": [
        "(Haketia) so (used to introduce a new conversation or topic)"
      ],
      "tags": [
        "Haketia"
      ]
    }
  ],
  "word": "wa"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "lad",
        "2": "ary",
        "3": "ايوه",
        "tr": "iwa"
      },
      "expansion": "Moroccan Arabic ايوه (iwa)",
      "name": "bor"
    }
  ],
  "etymology_text": "Probably from Moroccan Arabic ايوه (iwa).",
  "head_templates": [
    {
      "args": {
        "1": "lad",
        "2": "interjection"
      },
      "expansion": "wa",
      "name": "head"
    }
  ],
  "lang": "Ladino",
  "lang_code": "lad",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        "Haketia",
        "Ladino entries with incorrect language header",
        "Ladino interjections",
        "Ladino lemmas",
        "Ladino terms borrowed from Moroccan Arabic",
        "Ladino terms derived from Moroccan Arabic",
        "Pages with 70 entries",
        "Pages with entries"
      ],
      "glosses": [
        "so (used to introduce a new conversation or topic)"
      ],
      "links": [
        [
          "so",
          "so"
        ]
      ],
      "raw_glosses": [
        "(Haketia) so (used to introduce a new conversation or topic)"
      ],
      "tags": [
        "Haketia"
      ]
    }
  ],
  "word": "wa"
}