How is a hypothesis best defined in scientific terms?

A hypothesis is best defined as a testable prediction or explanation for a scientific phenomenon because it serves as a foundation for scientific inquiry. It is not merely a guess; rather, it is formulated based on existing knowledge and observations, providing a clear statement that can be tested through experimentation or further observation. A good hypothesis should be specific and falsifiable, meaning that it can be supported or refuted based on experimental results. This characteristic of being testable enables scientists to gather data that either supports or contradicts the hypothesis, leading to deeper understanding and refinement of scientific theories.

In contrast, a conclusive explanation implies a finality that is not characteristic of a hypothesis, as hypotheses are subject to change based on new evidence. A broad generalization might lack the specificity required for testing and does not focus on individual phenomena. Lastly, an untestable theory does not fit the definition of a hypothesis, as scientific hypotheses must be capable of being tested and examined against observations or experiments. This distinct nature of a hypothesis highlights its critical role in the scientific method and exploration.