Using the correct language and definitions is crucial when teaching mathematics to students. It helps to avoid confusion and ensures that students have a clear understanding of the concepts being taught. Inaccurate or ambiguous language can lead to misunderstandings that can make it difficult for students to grasp the concepts, solve problems, and apply their knowledge. It is important to be consistent and accurate in the language and definitions used in mathematics to promote understanding, build confidence, and enable students to communicate their ideas effectively.