"άπαξ" meaning in Greek

{
  "etymology_templates": [
    {
      "args": {
        "1": "el",
        "2": "grc",
        "3": "ἅπαξ"
      },
      "expansion": "Ancient Greek ἅπαξ (hápax)",
      "name": "der"
    }
  ],
  "etymology_text": "From Ancient Greek ἅπαξ (hápax).",
  "forms": [
    {
      "form": "ápax",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "adverbs",
        "3": "",
        "4": "",
        "5": "",
        "6": "",
        "head": "",
        "sort": ""
      },
      "expansion": "άπαξ • (ápax)",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "άπαξ • (ápax)",
      "name": "el-adv"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Greek entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "english": "once and for all",
          "roman": "ápax dia pantós",
          "word": "άπαξ δια παντός"
        },
        {
          "english": "hapax legomenon",
          "roman": "ápax legómenon",
          "tags": [
            "neuter"
          ],
          "word": "άπαξ λεγόμενον"
        }
      ],
      "examples": [
        {
          "english": "I will say this once and will not repeat it.",
          "roman": "Tha to po ápax kai de tha to epanalávo.",
          "text": "Θα το πω άπαξ και δε θα το επαναλάβω.",
          "type": "example"
        }
      ],
      "glosses": [
        "once"
      ],
      "id": "en-άπαξ-el-adv-IAZRqLLV",
      "links": [
        [
          "once",
          "once"
        ]
      ]
    }
  ],
  "word": "άπαξ"
}

{
  "derived": [
    {
      "english": "once and for all",
      "roman": "ápax dia pantós",
      "word": "άπαξ δια παντός"
    },
    {
      "english": "hapax legomenon",
      "roman": "ápax legómenon",
      "tags": [
        "neuter"
      ],
      "word": "άπαξ λεγόμενον"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "el",
        "2": "grc",
        "3": "ἅπαξ"
      },
      "expansion": "Ancient Greek ἅπαξ (hápax)",
      "name": "der"
    }
  ],
  "etymology_text": "From Ancient Greek ἅπαξ (hápax).",
  "forms": [
    {
      "form": "ápax",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "adverbs",
        "3": "",
        "4": "",
        "5": "",
        "6": "",
        "head": "",
        "sort": ""
      },
      "expansion": "άπαξ • (ápax)",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "άπαξ • (ápax)",
      "name": "el-adv"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "Greek adverbs",
        "Greek entries with incorrect language header",
        "Greek lemmas",
        "Greek terms derived from Ancient Greek",
        "Greek terms with usage examples"
      ],
      "examples": [
        {
          "english": "I will say this once and will not repeat it.",
          "roman": "Tha to po ápax kai de tha to epanalávo.",
          "text": "Θα το πω άπαξ και δε θα το επαναλάβω.",
          "type": "example"
        }
      ],
      "glosses": [
        "once"
      ],
      "links": [
        [
          "once",
          "once"
        ]
      ]
    }
  ],
  "word": "άπαξ"
}