stationary point

noun

1. a point on a curve at which the tangent is either horizontal or vertical, such as a maximum, a minimum, or a point of inflection
2. astronomy a point in the apparent path of a planet when it reverses direction

Example Sentences

One solid stationary point in the looseness of this gentleman's character was, that he respected and admired his sister Amy.

From Project Gutenberg

Both of them make religion a stationary point, and not a motive of principle, forever progressing to perfection.

From Project Gutenberg