Why does the pronunciation of words in dictionaries usually have

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Popular and Complete English Dictionary: Exhibiting the Pronunciation, Etymology, and Explanation of Every Word Usually Employed in Science, Literature, and Art; Volume 1 by John Boag, Paperback

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An example of pronunciation variation in conversational speech, a

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Excerpt from New Universal Graphic Dictionary of the English Language Self-Pronouncing: Comprising Under One Alphabetical Arrangement, the Definition

New Universal Graphic Dictionary of the English Language Self-Pronouncing: Comprising Under One Alphabetical Arrangement, the Definition of Words, the

How to Use a Dictionary: 12 Steps (with Pictures) - wikiHow