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a monetary unit of American Samoa, Andorra, Antigua and Barbuda, Aruba, Australia, Austria, the Bahamas, Barbados, Belgium, Belize, Bermuda, Bosnia-Hercegovina, Brunei, Canada, the Cayman Islands, Cyprus, Dominica, East Timor, Ecuador, El Salvador, Ethiopia, Fiji, Finland, France, French Guiana, Germany, Greece, Grenada, Guadeloupe, Guam, Guyana, Hong Kong, Ireland, Italy, Jamaica, Kenya, Kiribati, Kosovo, Liberia, Luxembourg, Malaysia, Malta, the Marshall Islands, Martinique, Mauritius, Mayotte, Micronesia, Monaco, Montenegro, Namibia, Nauru, the Netherlands, the Netherlands Antilles, New Zealand, the Northern Mariana Islands, Palau, Portugal, Puerto Rico, Réunion, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, San Marino, the Seychelles, Sierra Leone, Singapore, Slovakia, Slovenia, the Solomon Islands, Somalia, South Africa, Spain, Sri Lanka, Surinam, Swaziland, Taiwan, Tanzania, Trinidad and Tobago, Tuvalu, Uganda, the United States, the Vatican City, the Virgin Islands, and Zimbabwe. It is worth one hundredth of their respective standard units

an interval of pitch between two frequencies f 2 and f 1 equal to 3986.31 log ( f 2 / f 1 ); one twelve-hundredth of the interval between two frequencies having the ratio 1:2 (an octave)