Question

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Why are words in a dictionary not capitalized?

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Answer 1

Answer:

Your first stop in answering questions about the capitalization or spelling of a specific word in an APA Style paper should be the dictionary. ... Their opposite, regular or “common” nouns (which refer to general persons, places, or things), are lowercase in English and thus in APA Style as well.

Answer 2

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I cannot speak for all dictionaries, but the phrases the dictionary gave you don't necessarily start a sentence, so sentence caps are unnecessary. As JR said, the dictionary is showing an example usage, not an example sentence.