means the quality of being steady, balanced, and resistant to change or collapse, whether physical, emotional, or financial.

from From Latin 'stabilitas,' built on 'stabilis' (steady, firm) — itself rooted in 'stare,' to stand. The same standing-still ancestor props up 'stable,' 'station,' and 'statue.' English borrowed it through Old French 'stableté' in the Middle Ages, and the word has been holding its ground ever since.