"OPA" meaning in English

{
  "forms": [
    {
      "form": "OPAs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "OPA (plural OPAs)",
      "name": "en-noun"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "optionally piloted aircraft"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
        },
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          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
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      ],
      "coordinate_terms": [
        {
          "word": "cruise missile"
        },
        {
          "word": "drone"
        },
        {
          "word": "model airplane"
        },
        {
          "english": "remote control",
          "word": "RC"
        },
        {
          "english": "remotely operated vehicle",
          "word": "ROV"
        },
        {
          "english": "unmanned aerial vehicle",
          "word": "UAV"
        },
        {
          "english": "unmanned combat aerial vehicle",
          "word": "UCAV"
        }
      ],
      "glosses": [
        "Abbreviation of optionally piloted aircraft."
      ],
      "id": "en-OPA-en-noun-9JKXzFeQ",
      "links": [
        [
          "optionally piloted aircraft",
          "optionally piloted aircraft#English"
        ]
      ],
      "related": [
        {
          "english": "remotely piloted aircraft",
          "word": "RPA"
        }
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "OPA"
}

{
  "coordinate_terms": [
    {
      "word": "cruise missile"
    },
    {
      "word": "drone"
    },
    {
      "word": "model airplane"
    },
    {
      "english": "remote control",
      "word": "RC"
    },
    {
      "english": "remotely operated vehicle",
      "word": "ROV"
    },
    {
      "english": "unmanned aerial vehicle",
      "word": "UAV"
    },
    {
      "english": "unmanned combat aerial vehicle",
      "word": "UCAV"
    }
  ],
  "forms": [
    {
      "form": "OPAs",
      "tags": [
        "plural"
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    }
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      "expansion": "OPA (plural OPAs)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "english": "remotely piloted aircraft",
      "word": "RPA"
    }
  ],
  "senses": [
    {
      "alt_of": [
        {
          "word": "optionally piloted aircraft"
        }
      ],
      "categories": [
        "English abbreviations",
        "English countable nouns",
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      ],
      "glosses": [
        "Abbreviation of optionally piloted aircraft."
      ],
      "links": [
        [
          "optionally piloted aircraft",
          "optionally piloted aircraft#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "OPA"
}