Understanding a concept means you get it. Knowledge about a subject, situation, etc. Or about how something works:
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Understanding is a relation between the knower and an object of understanding. How to use understanding in a sentence. Understanding implies abilities and dispositions with respect to an object.
The meaning of understanding is a mental grasp :
Both comprehension and understanding can be used to talk about someone's ability to understand something. Comprehension usually used with of. He noted bond's apparent lack of. Your understanding might be that your mother will always drive you to school if you miss the bus.