"-isco" meaning in Italian

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "la",
        "3": "-ēscō"
      },
      "expansion": "Latin -ēscō",
      "name": "inh"
    },
    {
      "args": {
        "1": "ro",
        "2": "-esc"
      },
      "expansion": "Romanian -esc",
      "name": "cog"
    },
    {
      "args": {
        "1": "es",
        "2": "-ezco"
      },
      "expansion": "Spanish -ezco",
      "name": "cog"
    }
  ],
  "etymology_text": "A form of the infix -isc-, from Latin -ēscō. Cognates include Romanian -esc, Spanish -ezco.",
  "lang": "Italian",
  "lang_code": "it",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "used with a stem to form the first-person singular present of most regular -ire verbs"
      ],
      "id": "en--isco-it-suffix-kNn2ux67",
      "links": [
        [
          "first-person",
          "first person#English"
        ],
        [
          "singular",
          "singular#English"
        ],
        [
          "present",
          "present#English"
        ],
        [
          "-ire",
          "-ire#Italian"
        ]
      ],
      "related": [
        {
          "word": "-isci"
        },
        {
          "word": "-isce"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-isco"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "la",
        "3": "-ēscō"
      },
      "expansion": "Latin -ēscō",
      "name": "inh"
    },
    {
      "args": {
        "1": "ro",
        "2": "-esc"
      },
      "expansion": "Romanian -esc",
      "name": "cog"
    },
    {
      "args": {
        "1": "es",
        "2": "-ezco"
      },
      "expansion": "Spanish -ezco",
      "name": "cog"
    }
  ],
  "etymology_text": "A form of the infix -isc-, from Latin -ēscō. Cognates include Romanian -esc, Spanish -ezco.",
  "lang": "Italian",
  "lang_code": "it",
  "pos": "suffix",
  "related": [
    {
      "word": "-isci"
    },
    {
      "word": "-isce"
    }
  ],
  "senses": [
    {
      "categories": [
        "Italian entries with incorrect language header",
        "Italian non-lemma forms",
        "Italian suffix forms",
        "Italian terms derived from Latin",
        "Italian terms inherited from Latin"
      ],
      "glosses": [
        "used with a stem to form the first-person singular present of most regular -ire verbs"
      ],
      "links": [
        [
          "first-person",
          "first person#English"
        ],
        [
          "singular",
          "singular#English"
        ],
        [
          "present",
          "present#English"
        ],
        [
          "-ire",
          "-ire#Italian"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-isco"
}