Englishfor English speakers
usable
Adjective
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If something is usable, then it can be used.
national
Adjective
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If something is national it affects a whole nation or country.
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If something is national it has to do with a certain nation or country, or with people from that country.
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If a business is national it is found in all or most parts of a nation or country.
national
Noun
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A national is someone who is a citizen of their nation.
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The nationals is a tournament where people from all over the country come to compete in.
currency
Noun
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A currency is the money from a particular country.
A person going abroad can obtain foreign currency notes and travellers' cheques from his own bank.
The US dollar ended lower against most other currencies in London.
Since then the exchange value of the currency has fallen by 78%.
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If something has currency, it is generally accepted.
After the war, these new ideas began to gain currency.
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The state of being up to date.
A book's bibliography can be a good indicator of currency in the text.