1. A continuously bending line that has no straight parts or angles: Karl had to slow his car down while he was driving around the curves in the road.

A simple curve is one in which no two points come together, except possibly, the end points; for example, a circle is a simple closed curve.

2. Etymology: from Latin curvare, "to bend, to twist, to turn".

To bend in a circular direction: The highway curved to the right and to the left as Jill was driving around a mountainous road.

Thinking forward of a trend or trends.

Slow to react to something that is about to happen.

A line that gives the correct value for each indicated reading of a meter or control dial.

The rate at which a person mentally acquires new knowledge or the skills developed during a training program: This subject in physics has a steep learning curve and there are many other learning curves that will need to be overcome.