What word refers to something that is widely accepted or practiced?

The term that refers to something that is widely accepted or practiced is "prevalent." This word denotes a state of being widespread or common within a certain context or environment. It is often used to describe trends, beliefs, or practices that have gained significant traction among a large population or a particular group. For example, when discussing social behaviors or health practices, one might say that certain norms are prevalent if they are adopted by most individuals within a community. This connotation emphasizes the idea of acceptance and commonality among people, which aligns well with the question's focus on widespread acceptance.

The other terms, while having distinctive meanings, do not convey the same sense of widespread acceptance. "Pivotal" indicates something of crucial importance, "pleasant" pertains to something enjoyable or agreeable, and "pompous" relates to arrogance or self-importance. Hence, they do not capture the essence of being widely accepted or practiced in the same way "prevalent" does.