Englishfor English speakers
unique
Adjective
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If something is unique, it is one of a kind; it is unmatched.
When the school for the deaf opened, it was unique in Europe.
Of course, the problem is not unique to this country.
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If something is unique, it is rare or unusual.
Oh, thank you! What a unique gift!
Living in Japan was a unique experience.
index
Noun
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An index is an alphabetical (A to Z) list, usually at the back of a book, where you can find the pages in a book that talk about particular things or words.
Look in the index to see where they talk about Chomsky.
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An index shows the level of prices, wages, etc. so you can compare them with those of an earlier date.
On Wall Street, the Dow Jones index closed 10 points up at 2,731.23.
index
Verb
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If you index something, you make an index (guide) for it.
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If you index something to a certain price level, you make it go up or down with that level.