Definition:Stationary Model

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Definition

A stationary model is a stochastic model for describing a time series which assumes that the underlying stochastic process remains in equilibrium about a constant mean level.

That is, it is a stochastic model with an underlying stochastic process which is itself stationary.

Sources

$1$: Introduction:
$1.2$ Stochastic and Deterministic Dynamic Mathematical Models:
$1.2.1$ Stationary and Nonstationary Stochastic Models for Forecasting and Control