"mts." meaning in Spanish

{
  "head_templates": [
    {
      "args": {
        "1": "es",
        "2": "noun form"
      },
      "expansion": "mts.",
      "name": "head"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "meters",
          "word": "metros"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 3 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"
        }
      ],
      "glosses": [
        "Abbreviation of metros (“meters”)."
      ],
      "id": "en-mts.-es-noun-jme95NMi",
      "links": [
        [
          "metros",
          "metros#Spanish"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "mts."
}

{
  "head_templates": [
    {
      "args": {
        "1": "es",
        "2": "noun form"
      },
      "expansion": "mts.",
      "name": "head"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "meters",
          "word": "metros"
        }
      ],
      "categories": [
        "Pages with 3 entries",
        "Pages with entries",
        "Spanish abbreviations",
        "Spanish entries with incorrect language header",
        "Spanish non-lemma forms",
        "Spanish noun forms",
        "Spanish terms spelled with ."
      ],
      "glosses": [
        "Abbreviation of metros (“meters”)."
      ],
      "links": [
        [
          "metros",
          "metros#Spanish"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "mts."
}