"a posta" meaning in Spanish

{
  "head_templates": [
    {
      "args": {
        "head": "a posta"
      },
      "expansion": "a posta",
      "name": "es-adv"
    }
  ],
  "hyphenation": [
    "a"
  ],
  "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"
        }
      ],
      "form_of": [
        {
          "word": "aposta"
        }
      ],
      "glosses": [
        "Rare form of aposta."
      ],
      "id": "en-a_posta-es-adv-sEFWPzPN",
      "links": [
        [
          "aposta",
          "aposta#Spanish"
        ]
      ],
      "tags": [
        "form-of",
        "rare"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/a ˈposta/"
    },
    {
      "ipa": "[a ˈpos.t̪a]"
    }
  ],
  "word": "a posta"
}

{
  "head_templates": [
    {
      "args": {
        "head": "a posta"
      },
      "expansion": "a posta",
      "name": "es-adv"
    }
  ],
  "hyphenation": [
    "a"
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "Pages with 2 entries",
        "Pages with entries",
        "Spanish adverbs",
        "Spanish entries with incorrect language header",
        "Spanish lemmas",
        "Spanish multiword terms",
        "Spanish rare forms",
        "Spanish terms with IPA pronunciation",
        "Spanish terms with audio pronunciation"
      ],
      "form_of": [
        {
          "word": "aposta"
        }
      ],
      "glosses": [
        "Rare form of aposta."
      ],
      "links": [
        [
          "aposta",
          "aposta#Spanish"
        ]
      ],
      "tags": [
        "form-of",
        "rare"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/a ˈposta/"
    },
    {
      "ipa": "[a ˈpos.t̪a]"
    }
  ],
  "word": "a posta"
}