The term "stable" refers to something that is steady, secure, and not likely to change suddenly. For example, a stable building is well-constructed and can withstand various weather conditions without collapsing. In a broader sense, stability can apply to systems, economies, or relationships that maintain a consistent state over time. In science, "stable" can describe elements or compounds that do not easily react with others. For instance, a stable isotope of an element does not undergo radioactive decay. This stability is important in various fields, including chemistry and physics, as it helps predict behavior and outcomes in experiments and applications.