"reserve currency" meaning in English

{
  "forms": [
    {
      "form": "reserve currencies",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "reserve currency (plural reserve currencies)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Economics",
          "orig": "en:Economics",
          "parents": [
            "Social sciences",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A foreign currency that is held in reserve as foreign exchange reserves."
      ],
      "id": "en-reserve_currency-en-noun-II186qpW",
      "links": [
        [
          "economics",
          "economics"
        ]
      ],
      "raw_glosses": [
        "(economics) A foreign currency that is held in reserve as foreign exchange reserves."
      ],
      "related": [
        {
          "word": "Asiadollar"
        },
        {
          "word": "Eurodollar"
        }
      ],
      "topics": [
        "economics",
        "science",
        "sciences"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "Translations",
          "word": "varantovaluutta"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "Translations",
          "tags": [
            "feminine"
          ],
          "word": "Währungsreserve"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "rezérvnaja valjúta",
          "sense": "Translations",
          "tags": [
            "feminine"
          ],
          "word": "резе́рвная валю́та"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "Translations",
          "tags": [
            "common-gender"
          ],
          "word": "reservvaluta"
        },
        {
          "code": "vi",
          "lang": "Vietnamese",
          "sense": "Translations",
          "word": "tiền tệ dự trữ"
        }
      ]
    }
  ],
  "word": "reserve currency"
}

{
  "forms": [
    {
      "form": "reserve currencies",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "reserve currency (plural reserve currencies)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "Asiadollar"
    },
    {
      "word": "Eurodollar"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Translation table header lacks gloss",
        "en:Economics"
      ],
      "glosses": [
        "A foreign currency that is held in reserve as foreign exchange reserves."
      ],
      "links": [
        [
          "economics",
          "economics"
        ]
      ],
      "raw_glosses": [
        "(economics) A foreign currency that is held in reserve as foreign exchange reserves."
      ],
      "topics": [
        "economics",
        "science",
        "sciences"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "Translations",
      "word": "varantovaluutta"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "Währungsreserve"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "rezérvnaja valjúta",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "резе́рвная валю́та"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "Translations",
      "tags": [
        "common-gender"
      ],
      "word": "reservvaluta"
    },
    {
      "code": "vi",
      "lang": "Vietnamese",
      "sense": "Translations",
      "word": "tiền tệ dự trữ"
    }
  ],
  "word": "reserve currency"
}