"S.I." meaning in Latin

{
  "head_templates": [
    {
      "args": {
        "1": "S.I.",
        "g": "f",
        "indecl": "1"
      },
      "expansion": "S.I. f (indeclinable)",
      "name": "la-proper noun"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "Society of Jesus",
          "word": "Societās Iēsū"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Latin entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "la",
          "name": "Roman Catholicism",
          "orig": "la:Roman Catholicism",
          "parents": [
            "Catholicism",
            "Christianity",
            "Abrahamism",
            "Religion",
            "Culture",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The Jesuits; Abbreviation of Societās Iēsū (“Society of Jesus”)."
      ],
      "id": "en-S.I.-la-name-YdnJ4suk",
      "links": [
        [
          "Roman Catholicism",
          "Roman Catholicism"
        ],
        [
          "Jesuits",
          "Jesuits#English"
        ],
        [
          "Societās Iēsū",
          "Societas Iesu#Latin"
        ]
      ],
      "raw_glosses": [
        "(Roman Catholicism) The Jesuits; Abbreviation of Societās Iēsū (“Society of Jesus”)."
      ],
      "synonyms": [
        {
          "word": "SI"
        },
        {
          "word": "S. I."
        },
        {
          "word": "S. J."
        }
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "feminine",
        "indeclinable"
      ],
      "topics": [
        "Catholicism",
        "Christianity",
        "Roman-Catholicism"
      ]
    }
  ],
  "word": "S.I."
}

{
  "head_templates": [
    {
      "args": {
        "1": "S.I.",
        "g": "f",
        "indecl": "1"
      },
      "expansion": "S.I. f (indeclinable)",
      "name": "la-proper noun"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "Society of Jesus",
          "word": "Societās Iēsū"
        }
      ],
      "categories": [
        "Latin abbreviations",
        "Latin entries with incorrect language header",
        "Latin feminine indeclinable nouns",
        "Latin feminine nouns",
        "Latin indeclinable nouns",
        "Latin lemmas",
        "Latin proper nouns",
        "Latin terms spelled with .",
        "la:Roman Catholicism"
      ],
      "glosses": [
        "The Jesuits; Abbreviation of Societās Iēsū (“Society of Jesus”)."
      ],
      "links": [
        [
          "Roman Catholicism",
          "Roman Catholicism"
        ],
        [
          "Jesuits",
          "Jesuits#English"
        ],
        [
          "Societās Iēsū",
          "Societas Iesu#Latin"
        ]
      ],
      "raw_glosses": [
        "(Roman Catholicism) The Jesuits; Abbreviation of Societās Iēsū (“Society of Jesus”)."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "feminine",
        "indeclinable"
      ],
      "topics": [
        "Catholicism",
        "Christianity",
        "Roman-Catholicism"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "SI"
    },
    {
      "word": "S. I."
    },
    {
      "word": "S. J."
    }
  ],
  "word": "S.I."
}