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