How is the term "linear" best defined?

The term "linear" is best defined as "sequential progression" because it describes a pattern or arrangement in which elements are organized in a straight line or in a sequence. This implies that there is a clear, direct relationship among the elements, where one follows another in a consistent order. In various contexts, such as mathematics, writing, or even time, thinking linearly means moving from point A to point B without deviation or distraction, thus facilitating clarity and understanding.

In contrast, the other terms do not capture the essence of "linear." For example, "random" refers to a lack of predictable order or sequence, which is fundamentally different from a linear approach. "Circular" suggests a loop or cycle, where the process returns to its starting point, again differing from a straightforward progression. Lastly, "vague movement" implies uncertainty or lack of direction, standing in opposition to the clear and defined nature of linear progression.