stationary point(redirected from Horizontal inflection point)
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stationary pointSee direct motion.
stationary point[′stā·shə‚ner·ē ′pȯint]
A point at which a planet's apparent motion changes from direct to retrograde motion, or vice versa.
A point on a curve at which the tangent is horizontal.
For a function of several variables, a point at which all partial derivatives are 0.