- Of, pertaining to, or in the shape of a line. For instance, a system whose components are arranged in a line.
- Describing, described by, or following the course of a line. For example, the movement of a robotic arm along the length of a line.
- A relationship in which one value is directly proportional to another. For instance, an electronic device whose output is directly proportional to its input. When such a response is graphed, the result is a straight line, which may or may not be sloped. Also, pertaining to such a relationship.
- Having only one dimension, or measured only in terms of length.
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