"-sio" meaning in Latin

{
  "forms": [
    {
      "form": "-siō",
      "tags": [
        "canonical",
        "feminine"
      ]
    },
    {
      "form": "-siōnis",
      "tags": [
        "genitive"
      ]
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "suffix",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "takes this form when suffixed to primarily third conjugation verbs with stems ending in -t-, -d-, -rg-, -ll-, or -rr-",
          "word": "-tiō"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Latin entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Latin feminine suffixes in the third declension",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Alternative form of -tiō (takes this form when suffixed to primarily third conjugation verbs with stems ending in -t-, -d-, -rg-, -ll-, or -rr-)."
      ],
      "id": "en--sio-la-suffix-QbKMGxwH",
      "links": [
        [
          "-tiō",
          "-tio#Latin"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "declension-3",
        "morpheme"
      ]
    }
  ],
  "word": "-sio"
}

{
  "forms": [
    {
      "form": "-siō",
      "tags": [
        "canonical",
        "feminine"
      ]
    },
    {
      "form": "-siōnis",
      "tags": [
        "genitive"
      ]
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "suffix",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "takes this form when suffixed to primarily third conjugation verbs with stems ending in -t-, -d-, -rg-, -ll-, or -rr-",
          "word": "-tiō"
        }
      ],
      "categories": [
        "Latin entries with incorrect language header",
        "Latin feminine suffixes",
        "Latin feminine suffixes in the third declension",
        "Latin lemmas",
        "Latin noun-forming suffixes",
        "Latin suffixes",
        "Latin suffixes with red links in their inflection tables",
        "Latin third declension suffixes"
      ],
      "glosses": [
        "Alternative form of -tiō (takes this form when suffixed to primarily third conjugation verbs with stems ending in -t-, -d-, -rg-, -ll-, or -rr-)."
      ],
      "links": [
        [
          "-tiō",
          "-tio#Latin"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "declension-3",
        "morpheme"
      ]
    }
  ],
  "word": "-sio"
}