What is the definition of a proper noun?

The definition of a proper noun is indeed a particular person, place, thing, quality, idea, or action. Proper nouns are specific names given to individual entities, which distinguish them from common nouns that refer to general items or concepts. For example, 'Rosa Parks' is a proper noun because it identifies a specific individual, while 'activist' is a common noun that could refer to any activist.

In this context, a proper noun is important because it provides clarity and specificity in language, allowing us to identify unique entities in our communication. This specificity is crucial in clear writing and effective communication, distinguishing one subject from another within a text.