"-i-" meaning in Latin

{
  "etymology_text": "From the reduction of several historical unstressed short stem vowels during the Old Latin period. The reduced vowel was later reinterpreted as part of various suffixes.",
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "interfix"
      },
      "expansion": "-i-",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "interfix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Latin entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Latin interfixes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 9 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Connecting vowel inserted between a stem and a suffix or other appended words in compound words."
      ],
      "id": "en--i--la-interfix-OMk0Kkp6",
      "links": [
        [
          "vowel",
          "vowel#English"
        ],
        [
          "stem",
          "stem#English"
        ],
        [
          "suffix",
          "suffix#English"
        ],
        [
          "compound word",
          "compound word#English"
        ]
      ],
      "tags": [
        "morpheme"
      ],
      "wikipedia": [
        "History of Latin#Vowels"
      ]
    }
  ],
  "word": "-i-"
}

{
  "etymology_text": "From the reduction of several historical unstressed short stem vowels during the Old Latin period. The reduced vowel was later reinterpreted as part of various suffixes.",
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "interfix"
      },
      "expansion": "-i-",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "interfix",
  "senses": [
    {
      "categories": [
        "Latin entries with incorrect language header",
        "Latin interfixes",
        "Latin lemmas",
        "Pages using catfix",
        "Pages with 9 entries",
        "Pages with entries"
      ],
      "glosses": [
        "Connecting vowel inserted between a stem and a suffix or other appended words in compound words."
      ],
      "links": [
        [
          "vowel",
          "vowel#English"
        ],
        [
          "stem",
          "stem#English"
        ],
        [
          "suffix",
          "suffix#English"
        ],
        [
          "compound word",
          "compound word#English"
        ]
      ],
      "tags": [
        "morpheme"
      ],
      "wikipedia": [
        "History of Latin#Vowels"
      ]
    }
  ],
  "word": "-i-"
}