1. not remaining in a fixed position; moving or changing location
2. having statistical properties that change over time
Usage: statistics; mathematics

Examples

• The nonstationary satellite orbited Earth in an elliptical path.
• Mobile phones are nonstationary devices that people carry everywhere.
• The research team studied nonstationary weather patterns over decades.
• Nonstationary time series data requires special analytical methods.
• The nonstationary process showed varying mean values throughout the observation period.
• Economic indicators often exhibit nonstationary behavior during periods of change.