Englishfor English speakers
corruption
Noun
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Corruption is the improper use of power to benefit yourself.
The corruption among police increased when their pay was cut.
perception
Noun
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Perception is the action of seeing, hearing, smelling, touching and/or tasting an object that made an impression on the senses.
The government hopes to change the public's perception of the problem.
When we asked people what they thought, we found there was a big difference between their perception and reality.
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.