"-s" meaning in Spanish

{
  "etymology_text": "Derived from the Latin accusative plural endings (-ās, -ōs, -ēs).",
  "head_templates": [
    {
      "args": {
        "1": "es",
        "2": "suffix form"
      },
      "expansion": "-s",
      "name": "head"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 34 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "amigo (“friend”) + -s → amigos (“friends”)"
        },
        {
          "text": "cocina (“kitchen”) + -s → cocinas (“kitchens”)"
        }
      ],
      "glosses": [
        "Used to form the regular plural of nouns and adjectives which end in vowels."
      ],
      "id": "en--s-es-suffix-yRPS6ULm",
      "related": [
        {
          "word": "-es"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-s"
}

{
  "categories": [
    "Pages with 34 entries",
    "Pages with entries"
  ],
  "etymology_text": "Derived from the Latin accusative plural endings (-ās, -ōs, -ēs).",
  "head_templates": [
    {
      "args": {
        "1": "es",
        "2": "suffix form"
      },
      "expansion": "-s",
      "name": "head"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "suffix",
  "related": [
    {
      "word": "-es"
    }
  ],
  "senses": [
    {
      "categories": [
        "Pages with 34 entries",
        "Pages with entries",
        "Spanish entries with incorrect language header",
        "Spanish non-lemma forms",
        "Spanish suffix forms"
      ],
      "examples": [
        {
          "text": "amigo (“friend”) + -s → amigos (“friends”)"
        },
        {
          "text": "cocina (“kitchen”) + -s → cocinas (“kitchens”)"
        }
      ],
      "glosses": [
        "Used to form the regular plural of nouns and adjectives which end in vowels."
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-s"
}