invariance, n.All

Invariance (n.) and ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠variability (n.) do not separate two domains from each other; they divide each domain within itself.