Which of the following defines a collective noun?

The correct definition of a collective noun is one that refers to a group. Collective nouns describe a collection of individuals or things viewed as a single unit, such as "team," "flock," or "family." These nouns are used to represent multiple entities while treating them as one, which is essential in expressing collective actions or characteristics shared by the group. Understanding this concept helps in identifying and using collective nouns appropriately in sentences, showcasing their unique role in language. The other options describe different types of nouns; for instance, a single entity refers to individual nouns, an action is conveyed through verbs, and expressing a quality pertains to adjectives.