"-enda" meaning in Ido

{
  "etymology_text": "Secondary meaning of the Latin future passive participle in -ndus, -nda, -ndum, e.g. Carthago delenda est, \"Carthage must be destroyed.\" See English agenda, tacenda, etc.",
  "head_templates": [
    {
      "args": {
        "1": "io",
        "2": "suffix",
        "cat2": "adjective-forming suffixes",
        "cat3": ""
      },
      "expansion": "-enda",
      "name": "head"
    },
    {
      "args": {
        "1": "a"
      },
      "expansion": "-enda",
      "name": "io-suffix"
    }
  ],
  "lang": "Ido",
  "lang_code": "io",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ido entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "suffix added to a verbal root to indicate what should be, or needs to be, done"
      ],
      "id": "en--enda-io-suffix-gQQHLVrd",
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-enda"
}

{
  "etymology_text": "Secondary meaning of the Latin future passive participle in -ndus, -nda, -ndum, e.g. Carthago delenda est, \"Carthage must be destroyed.\" See English agenda, tacenda, etc.",
  "head_templates": [
    {
      "args": {
        "1": "io",
        "2": "suffix",
        "cat2": "adjective-forming suffixes",
        "cat3": ""
      },
      "expansion": "-enda",
      "name": "head"
    },
    {
      "args": {
        "1": "a"
      },
      "expansion": "-enda",
      "name": "io-suffix"
    }
  ],
  "lang": "Ido",
  "lang_code": "io",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Ido adjective-forming suffixes",
        "Ido entries with incorrect language header",
        "Ido lemmas",
        "Ido suffixes",
        "Pages using catfix",
        "Pages with 3 entries",
        "Pages with entries"
      ],
      "glosses": [
        "suffix added to a verbal root to indicate what should be, or needs to be, done"
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-enda"
}