What word describes something abundant or plentiful?

The word that describes something abundant or plentiful is "copious." This term specifically refers to a large quantity of something, emphasizing the notion of having more than enough. For instance, when one speaks of a "copious amount of rain," it suggests that the rain is not just present but in great abundance, which can lead to significant effects, such as flooding.

In contrast, the other options do not convey the idea of abundance. "Acrid" describes something that is sharp or pungent in taste or smell, often unpleasant, but it does not relate to quantity. "Revelry" refers to lively and noisy festivities or celebrations, focusing on the event rather than the idea of abundance in a quantitative sense. On the other hand, "fitful" refers to something that occurs in irregular or intermittent bursts, indicating inconsistency rather than plenty. Thus, "copious" is the term that accurately captures the essence of abundance.