Stability (wěn dìng xìng) is a noun formed by combining three characters: 稳 (wěn), meaning 'steady' or 'secure'; 定 (dìng), meaning 'fixed', 'settled', or 'determined'; and 性 (xìng), a common nominal suffix meaning 'nature', 'property', or 'quality'. Together, they describe the inherent quality of remaining unchanged, balanced, or resistant to disruption over time. It’s widely used in technical, scientific, medical, and everyday contexts—such as describing the stability of a patient’s vital signs, the structural integrity of a building, or the consistency of a software system.

This word often appears after classifiers like 'the' or demonstratives ('this', 'that') and frequently follows adjectives or nouns indicating domain—e.g., 'economic stability' (经济稳定性), 'emotional stability' (情绪稳定性), or 'chemical stability' (化学稳定性). While it can be used abstractly, it always implies measurable or observable resistance to change or fluctuation.