What does it mean to grasp or be thoroughly familiar with an idea or concept?

To be thoroughly familiar with an idea or concept means to have a deep and comprehensive awareness of its key elements, implications, and context. This level of familiarity goes beyond simply knowing about the topic; it encompasses the ability to connect ideas, apply them in different situations, and critically analyze their significance.

Understanding involves grasping the underlying principles and having the capability to explain or communicate those ideas to others effectively. It implies not only a cognitive engagement with the material but also a practical ability to use that knowledge in various contexts. This makes understanding the most fitting choice in the context of familiarity with an idea or concept.