Englishfor English speakers
depth
Noun
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The distance below a surface; how deep something is.
Measure the depth of the water in this part of the bay.
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The distance between the front and the back, such as the depth of a drawer or closet.
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How intense, complex, strong, serious or important an emotion or situation is.
The depth of her misery was obvious to everyone.
The depth of the crisis had been exaggerated.
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Looking three-dimensional.
The depth of field in this picture is amazing.
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.