"-ís" meaning in Spanish

{
  "etymology_templates": [
    {
      "args": {
        "1": "es",
        "2": "la",
        "3": "-ītis"
      },
      "expansion": "Latin -ītis",
      "name": "inh"
    }
  ],
  "etymology_text": "From Latin -ītis.",
  "head_templates": [
    {
      "args": {
        "1": "es",
        "2": "suffix form"
      },
      "expansion": "-ís",
      "name": "head"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Suffix indicating the second-person plural present indicative of -ir verbs."
      ],
      "id": "en--ís-es-suffix-SdghZfMa",
      "links": [
        [
          "second-person plural",
          "second-person plural#English"
        ],
        [
          "present",
          "present#English"
        ],
        [
          "indicative",
          "indicative#English"
        ],
        [
          "-ir",
          "-ir#Spanish"
        ]
      ],
      "related": [
        {
          "word": "-áis"
        },
        {
          "word": "-éis"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-ís"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "es",
        "2": "la",
        "3": "-ītis"
      },
      "expansion": "Latin -ītis",
      "name": "inh"
    }
  ],
  "etymology_text": "From Latin -ītis.",
  "head_templates": [
    {
      "args": {
        "1": "es",
        "2": "suffix form"
      },
      "expansion": "-ís",
      "name": "head"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "suffix",
  "related": [
    {
      "word": "-áis"
    },
    {
      "word": "-éis"
    }
  ],
  "senses": [
    {
      "categories": [
        "Spanish entries with incorrect language header",
        "Spanish non-lemma forms",
        "Spanish suffix forms",
        "Spanish terms derived from Latin",
        "Spanish terms inherited from Latin"
      ],
      "glosses": [
        "Suffix indicating the second-person plural present indicative of -ir verbs."
      ],
      "links": [
        [
          "second-person plural",
          "second-person plural#English"
        ],
        [
          "present",
          "present#English"
        ],
        [
          "indicative",
          "indicative#English"
        ],
        [
          "-ir",
          "-ir#Spanish"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-ís"
}