"a-" meaning in Polish

{
  "etymology_templates": [
    {
      "args": {
        "1": "pl",
        "2": "grk-pro",
        "3": "ine-pro"
      },
      "expansion": "",
      "name": "dercat"
    },
    {
      "args": {
        "1": "pl",
        "2": "grc",
        "3": "ἀ-"
      },
      "expansion": "Learned borrowing from Ancient Greek ἀ- (a-)",
      "name": "lbor"
    }
  ],
  "etymology_text": "Learned borrowing from Ancient Greek ἀ- (a-).",
  "head_templates": [
    {
      "args": {
        "1": "pl",
        "2": "prefix"
      },
      "expansion": "a-",
      "name": "head"
    }
  ],
  "hyphenation": [
    "[please"
  ],
  "lang": "Polish",
  "lang_code": "pl",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 52 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Polish entries with Template:pl-pr without syllabification",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Polish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "a- + społeczny → aspołeczny",
          "type": "example"
        }
      ],
      "glosses": [
        "forming words with the sense of negation, a-"
      ],
      "id": "en-a--pl-prefix-AhPoHl-0",
      "links": [
        [
          "a-",
          "a-#English"
        ]
      ],
      "synonyms": [
        {
          "word": "an-"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/a/"
    },
    {
      "rhymes": "-a"
    },
    {
      "homophone": "a"
    },
    {
      "homophone": "-a"
    }
  ],
  "word": "a-"
}

{
  "categories": [
    "Pages with 52 entries",
    "Pages with entries"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "pl",
        "2": "grk-pro",
        "3": "ine-pro"
      },
      "expansion": "",
      "name": "dercat"
    },
    {
      "args": {
        "1": "pl",
        "2": "grc",
        "3": "ἀ-"
      },
      "expansion": "Learned borrowing from Ancient Greek ἀ- (a-)",
      "name": "lbor"
    }
  ],
  "etymology_text": "Learned borrowing from Ancient Greek ἀ- (a-).",
  "head_templates": [
    {
      "args": {
        "1": "pl",
        "2": "prefix"
      },
      "expansion": "a-",
      "name": "head"
    }
  ],
  "hyphenation": [
    "[please"
  ],
  "lang": "Polish",
  "lang_code": "pl",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        "Pages using catfix",
        "Pages with 52 entries",
        "Pages with entries",
        "Polish 1-syllable words",
        "Polish entries with Template:pl-pr without syllabification",
        "Polish entries with incorrect language header",
        "Polish learned borrowings from Ancient Greek",
        "Polish lemmas",
        "Polish prefixes",
        "Polish terms borrowed from Ancient Greek",
        "Polish terms derived from Ancient Greek",
        "Polish terms derived from Proto-Hellenic",
        "Polish terms derived from Proto-Indo-European",
        "Polish terms with IPA pronunciation",
        "Polish terms with audio pronunciation",
        "Polish terms with homophones",
        "Rhymes:Polish/a",
        "Rhymes:Polish/a/1 syllable"
      ],
      "examples": [
        {
          "text": "a- + społeczny → aspołeczny",
          "type": "example"
        }
      ],
      "glosses": [
        "forming words with the sense of negation, a-"
      ],
      "links": [
        [
          "a-",
          "a-#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/a/"
    },
    {
      "rhymes": "-a"
    },
    {
      "homophone": "a"
    },
    {
      "homophone": "-a"
    }
  ],
  "synonyms": [
    {
      "word": "an-"
    }
  ],
  "word": "a-"
}