"ακουστικοί" meaning in Greek

{
  "forms": [
    {
      "form": "akoustikoí",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "adjective forms",
        "cat2": "",
        "head": "",
        "sort": ""
      },
      "expansion": "ακουστικοί • (akoustikoí)",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Greek entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "akoustikós",
          "word": "ακουστικός"
        }
      ],
      "glosses": [
        "Nominative and vocative masculine plural form of ακουστικός (akoustikós)."
      ],
      "id": "en-ακουστικοί-el-adj-zPeeiXaP",
      "links": [
        [
          "Nominative",
          "nominative"
        ],
        [
          "vocative",
          "vocative"
        ],
        [
          "masculine",
          "masculine"
        ],
        [
          "plural",
          "plural"
        ],
        [
          "ακουστικός",
          "ακουστικός#Greek"
        ]
      ],
      "tags": [
        "form-of",
        "masculine",
        "nominative",
        "plural",
        "vocative"
      ]
    }
  ],
  "word": "ακουστικοί"
}

{
  "forms": [
    {
      "form": "akoustikoí",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "adjective forms",
        "cat2": "",
        "head": "",
        "sort": ""
      },
      "expansion": "ακουστικοί • (akoustikoí)",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Greek adjective forms",
        "Greek entries with incorrect language header",
        "Greek non-lemma forms",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "form_of": [
        {
          "extra": "akoustikós",
          "word": "ακουστικός"
        }
      ],
      "glosses": [
        "Nominative and vocative masculine plural form of ακουστικός (akoustikós)."
      ],
      "links": [
        [
          "Nominative",
          "nominative"
        ],
        [
          "vocative",
          "vocative"
        ],
        [
          "masculine",
          "masculine"
        ],
        [
          "plural",
          "plural"
        ],
        [
          "ακουστικός",
          "ακουστικός#Greek"
        ]
      ],
      "tags": [
        "form-of",
        "masculine",
        "nominative",
        "plural",
        "vocative"
      ]
    }
  ],
  "word": "ακουστικοί"
}