A constant variable is often referred to as a fixed value or unchanging parameter. It can also be called a non-varying factor, a static entity, or an invariant quantity. Another common synonym for a constant variable is a control variable, which is used to determine the effects of an experiment by keeping certain conditions constant. It can also be referred to as a regulated or independent variable, as it determines the outcome of an experiment or observation. Constant variables play an important role in scientific research, mathematical calculations, and statistical analysis, and having a clear understanding of their synonyms can help convey ideas more precisely and accurately.