- Not in the shape of a straight line. Also, pertaining to that which is not in the shape of a straight line.
- A relationship in which one value is not directly proportional to another. For instance, an electronic device whose output is not directly proportional to its input. When such a response is graphed, the result is a curve. Also, pertaining to such a relationship.
- Not following the course of a straight line. Also, that which is described by a path which is not a straight line.
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