The term "main idea" refers to the central concept or message of a text. However, there are several other synonyms used to describe the same thing. Some common alternatives include "central idea," "key point," "primary theme," and "core concept." Other related phrases might include "the essence of the piece," "the heart of the matter," or simply "the big picture." Regardless of the specific phrasing, the importance of identifying and understanding the main idea of a given text cannot be overstated. By doing so, readers can gain a deeper understanding of the author's intended message and more effectively engage with the material.