stationarity; being stationary
Technical term used in computing, statistics, and signal processing to describe a process whose statistical properties do not change over time.
In time series analysis, the stationarity of the data is an important assumption.
このアルゴリズムは信号の定常性を仮定している。
This algorithm assumes the stationarity of the signal.
定常状態 means 'steady state', a related concept often used in physics and engineering, whereas 定常性 emphasizes the abstract property of stationarity.
Compound of 定常 (steady, stationary) + 性 (-ness, property). The exact historical derivation is uncertain; the term is a modern technical coinage.