"-i" meaning in Volapük

{
  "head_templates": [
    {
      "args": {
        "1": "vo",
        "2": "suffix"
      },
      "expansion": "-i",
      "name": "head"
    }
  ],
  "lang": "Volapük",
  "lang_code": "vo",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with raw sortkeys",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Volapük entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "The dog bites the man.",
          "text": "Dog beiton mani. / Mani beiton dog",
          "type": "example"
        },
        {
          "english": "The mother loves him. (e.g. the (male) child, son, or (male) lovebird).",
          "text": "Mot löfof omi. / Omi löfof mot. (a.s., hicili, soni, u higaaporn).",
          "type": "example"
        }
      ],
      "glosses": [
        "A morpheme used to mark the accusative singular of a word (such as a noun or pronoun)."
      ],
      "id": "en--i-vo-suffix-yws-e8K4",
      "links": [
        [
          "morpheme",
          "morpheme"
        ],
        [
          "accusative",
          "accusative"
        ],
        [
          "singular",
          "singular"
        ],
        [
          "word",
          "word"
        ],
        [
          "noun",
          "noun"
        ],
        [
          "pronoun",
          "pronoun"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-i"
}

{
  "head_templates": [
    {
      "args": {
        "1": "vo",
        "2": "suffix"
      },
      "expansion": "-i",
      "name": "head"
    }
  ],
  "lang": "Volapük",
  "lang_code": "vo",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Pages with raw sortkeys",
        "Volapük entries with incorrect language header",
        "Volapük lemmas",
        "Volapük suffixes",
        "Volapük terms with usage examples"
      ],
      "examples": [
        {
          "english": "The dog bites the man.",
          "text": "Dog beiton mani. / Mani beiton dog",
          "type": "example"
        },
        {
          "english": "The mother loves him. (e.g. the (male) child, son, or (male) lovebird).",
          "text": "Mot löfof omi. / Omi löfof mot. (a.s., hicili, soni, u higaaporn).",
          "type": "example"
        }
      ],
      "glosses": [
        "A morpheme used to mark the accusative singular of a word (such as a noun or pronoun)."
      ],
      "links": [
        [
          "morpheme",
          "morpheme"
        ],
        [
          "accusative",
          "accusative"
        ],
        [
          "singular",
          "singular"
        ],
        [
          "word",
          "word"
        ],
        [
          "noun",
          "noun"
        ],
        [
          "pronoun",
          "pronoun"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-i"
}