"a. m." meaning in Spanish

{
  "etymology_templates": [
    {
      "args": {
        "1": "es",
        "2": "la",
        "3": "ante meridiem",
        "4": "",
        "5": "before noon"
      },
      "expansion": "Latin ante meridiem (“before noon”)",
      "name": "bor"
    }
  ],
  "etymology_text": "Abbreviation of Latin ante meridiem (“before noon”).",
  "head_templates": [
    {
      "args": {
        "head": "a. m."
      },
      "expansion": "a. m.",
      "name": "es-adv"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 2 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"
        },
        {
          "kind": "topical",
          "langcode": "es",
          "name": "Time",
          "orig": "es:Time",
          "parents": [
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "a.m."
      ],
      "id": "en-a._m.-es-adv-e0VfLdeR",
      "links": [
        [
          "a.m.",
          "a.m."
        ]
      ],
      "related": [
        {
          "word": "p. m."
        }
      ]
    }
  ],
  "word": "a. m."
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "es",
        "2": "la",
        "3": "ante meridiem",
        "4": "",
        "5": "before noon"
      },
      "expansion": "Latin ante meridiem (“before noon”)",
      "name": "bor"
    }
  ],
  "etymology_text": "Abbreviation of Latin ante meridiem (“before noon”).",
  "head_templates": [
    {
      "args": {
        "head": "a. m."
      },
      "expansion": "a. m.",
      "name": "es-adv"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adv",
  "related": [
    {
      "word": "p. m."
    }
  ],
  "senses": [
    {
      "categories": [
        "Pages with 2 entries",
        "Pages with entries",
        "Spanish adverbs",
        "Spanish entries with incorrect language header",
        "Spanish lemmas",
        "Spanish multiword terms",
        "Spanish terms borrowed from Latin",
        "Spanish terms derived from Latin",
        "Spanish terms spelled with .",
        "es:Time"
      ],
      "glosses": [
        "a.m."
      ],
      "links": [
        [
          "a.m.",
          "a.m."
        ]
      ]
    }
  ],
  "word": "a. m."
}