redefinition

Redefinition is the act of giving a different or broader, or narrower, sense to an existing term, symbol, or concept. It occurs when new information, theories, or contexts make the old definition inadequate or misleading, prompting speakers to formalize a revised understanding.

In mathematics and logic, redefining a term involves specifying a new meaning that replaces or extends the old one. This can change the scope of objects considered, the properties assumed, or the operations allowed. Redefinition must be handled carefully to preserve consistency with existing results and to clarify implications for proofs, domains, and conventions.

In the sciences and philosophy, redefinition often signals conceptual change or refinement. Terms such as life, intelligence, or species may be reinterpreted as criteria evolve, leading to shifts in classification, methodology, or debate. Redefinition can improve explanatory power but may also require consensus on the new criteria.

In computer science, redefining a name typically means binding a name to a new value or function within a given scope. Many languages permit variable reassignment, while re-declaring a function or symbol in the same scope may be restricted or disallowed. The rules governing redefinition affect program behavior and readability.

In language and society, redefinition describes how words acquire new meanings or shed old ones over time, a process known as semantic shift. It can arise from cultural change, technology, or cross-cultural contact, and can alter how communities communicate and understand each other.

In law and policy, redefining terms through legislation or regulation reflects social change and can have broad practical consequences, influencing rights, responsibilities, and enforcement.