Which of the following is synonymous with regular?

The term "regular" denotes something that occurs at fixed intervals or is characterized by a consistent pattern or adherence to rules. "Systematic" captures this essence well, as it refers to a methodical and organized approach, often implying order and consistency in processes or actions. Thus, when something is described as systematic, it aligns closely with the idea of regularity, as both terms suggest a sense of predictability and structure.

In contrast, "irregular" directly opposes the notion of regular by indicating something that does not follow a consistent pattern. "Sporadic" suggests occurrences that happen at irregular intervals or intervals that are intermittent, which again diverges from the idea of consistency. "Random" points to lack of order or predictability, reinforcing the opposite of regularity. Therefore, "systematic" stands out as the term that embodies the same sense of consistent and organized behavior that "regular" conveys.