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