"a-" meaning in French

{
  "etymology_number": 1,
  "etymology_templates": [
    {
      "args": {
        "1": "Inherited"
      },
      "expansion": "Inherited",
      "name": "glossary"
    },
    {
      "args": {
        "1": "fr",
        "2": "fro",
        "3": "a-",
        "4": "",
        "5": "",
        "g": "",
        "g2": "",
        "g3": "",
        "id": "",
        "lit": "",
        "nocat": "",
        "pos": "",
        "sc": "",
        "sort": "",
        "tr": "",
        "ts": ""
      },
      "expansion": "Old French a-",
      "name": "inh"
    },
    {
      "args": {
        "1": "fr",
        "2": "fro",
        "3": "a-"
      },
      "expansion": "Inherited from Old French a-",
      "name": "inh+"
    },
    {
      "args": {
        "1": "fr",
        "2": "la",
        "3": "ad-"
      },
      "expansion": "Latin ad-",
      "name": "inh"
    }
  ],
  "etymology_text": "Inherited from Old French a-, from Latin ad-.",
  "head_templates": [
    {
      "args": {},
      "expansion": "a-",
      "name": "fr-prefix"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "prefix",
  "senses": [
    {
      "glosses": [
        "A prefix forming words, especially verbs, that denote entering a state, making progress toward a goal, or the like."
      ],
      "id": "en-a--fr-prefix-7cyA7XqG",
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/a/"
    }
  ],
  "word": "a-"
}

{
  "etymology_number": 2,
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "grc",
        "3": "ἀ-"
      },
      "expansion": "Ancient Greek ἀ- (a-)",
      "name": "der"
    },
    {
      "args": {
        "1": "grc",
        "2": "ἀν-"
      },
      "expansion": "ἀν- (an-)",
      "name": "m"
    }
  ],
  "etymology_text": "From Ancient Greek ἀ- (a-) (ἀν- (an-) immediately preceding a vowel; generalized from the many Latin borrowings using this prefix.",
  "head_templates": [
    {
      "args": {},
      "expansion": "a-",
      "name": "fr-prefix"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "_dis": "23 77",
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "a-, non-, -less"
      ],
      "id": "en-a--fr-prefix-9oA9tMQa",
      "links": [
        [
          "a-",
          "a-#English"
        ],
        [
          "non-",
          "non-"
        ],
        [
          "-less",
          "-less"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/a/"
    }
  ],
  "word": "a-"
}

{
  "categories": [
    "French 1-syllable words",
    "French entries with incorrect language header",
    "French lemmas",
    "French prefixes",
    "French terms derived from Ancient Greek",
    "French terms derived from Latin",
    "French terms derived from Old French",
    "French terms inherited from Latin",
    "French terms inherited from Old French",
    "French terms with IPA pronunciation"
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  "etymology_number": 1,
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    {
      "args": {
        "1": "fr",
        "2": "fro",
        "3": "a-",
        "4": "",
        "5": "",
        "g": "",
        "g2": "",
        "g3": "",
        "id": "",
        "lit": "",
        "nocat": "",
        "pos": "",
        "sc": "",
        "sort": "",
        "tr": "",
        "ts": ""
      },
      "expansion": "Old French a-",
      "name": "inh"
    },
    {
      "args": {
        "1": "fr",
        "2": "fro",
        "3": "a-"
      },
      "expansion": "Inherited from Old French a-",
      "name": "inh+"
    },
    {
      "args": {
        "1": "fr",
        "2": "la",
        "3": "ad-"
      },
      "expansion": "Latin ad-",
      "name": "inh"
    }
  ],
  "etymology_text": "Inherited from Old French a-, from Latin ad-.",
  "head_templates": [
    {
      "args": {},
      "expansion": "a-",
      "name": "fr-prefix"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "prefix",
  "senses": [
    {
      "glosses": [
        "A prefix forming words, especially verbs, that denote entering a state, making progress toward a goal, or the like."
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/a/"
    }
  ],
  "word": "a-"
}

{
  "categories": [
    "French 1-syllable words",
    "French entries with incorrect language header",
    "French lemmas",
    "French prefixes",
    "French terms derived from Ancient Greek",
    "French terms with IPA pronunciation"
  ],
  "etymology_number": 2,
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "grc",
        "3": "ἀ-"
      },
      "expansion": "Ancient Greek ἀ- (a-)",
      "name": "der"
    },
    {
      "args": {
        "1": "grc",
        "2": "ἀν-"
      },
      "expansion": "ἀν- (an-)",
      "name": "m"
    }
  ],
  "etymology_text": "From Ancient Greek ἀ- (a-) (ἀν- (an-) immediately preceding a vowel; generalized from the many Latin borrowings using this prefix.",
  "head_templates": [
    {
      "args": {},
      "expansion": "a-",
      "name": "fr-prefix"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "prefix",
  "senses": [
    {
      "glosses": [
        "a-, non-, -less"
      ],
      "links": [
        [
          "a-",
          "a-#English"
        ],
        [
          "non-",
          "non-"
        ],
        [
          "-less",
          "-less"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/a/"
    }
  ],
  "word": "a-"
}