"Monumental" refers to something that is exceptionally large, impressive, or significant. It often describes structures, artworks, or events that have a lasting impact or importance in history. For example, monuments like the Great Wall of China or the Statue of Liberty are considered monumental due to their size and cultural significance. In a broader sense, "monumental" can also apply to achievements or challenges that are particularly noteworthy. For instance, a scientific discovery that changes our understanding of the world may be described as monumental. This term emphasizes the scale and importance of the subject in question.