stability noun [U]. C1 a ​situation in which something is not ​likely to ​move or ​change: a ​period of ​political stability. More examples. ​ 1  Greater ​ international stability can ​ surely only be to the good. 2  A ​ loving ​ family ​ environment gives ​ children that ​ sense of stability and ​ permanence which they need.