Stationary - AbsoluteAstronomy.com

Stationary can mean:

In statistics and probability: a stationary process
Stationary process
In the mathematical sciences, a stationary process is a stochastic process whose joint probability distribution does not change when shifted in time or space...

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In mathematics: a stationary point
Stationary point
In mathematics, particularly in calculus, a stationary point is an input to a function where the derivative is zero : where the function "stops" increasing or decreasing ....

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In mathematics: a stationary set
Stationary set
In mathematics, particularly in set theory and model theory, there are at least three notions of stationary set:-Classical notion:If \kappa \, is a cardinal of uncountable cofinality, S \subseteq \kappa \,, and S \, intersects every club set in \kappa \,, then S \, is called a stationary set....

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In physics: a time-invariant quantity, such as a constant position or temperature.
In physics: a steady state
Steady state
A system in a steady state has numerous properties that are unchanging in time. This implies that for any property p of the system, the partial derivative with respect to time is zero:...

physical process, such as a vibration at constant amplitude and frequency or a steady fluid flow.

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