1. knowledge or understanding of what sth means/entails
a clear understanding/knowledge/appreciation of what is happening
If you have a clear understanding of something, it means you have a good understanding or knowledge of that topic or situation. Similarly, a clear knowledge of something involves being an expert in that area. To acquire a deeper understanding/knowledge or appreciation of something means to have spent time in the pursuit of learning or experiencing things that have broadened your view. To have a deep understanding/knowledge or appreciation of something usually means you have a huge amount of knowledge or appreciation for something on many levels. These are phrases you will hear in many contexts to describe a person's understanding or level of interest or experience.