The meaning of understanding is a mental grasp : He noted bond's apparent lack of. Understanding is a relation between the knower and an object of understanding.
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Understanding a concept means you get it. Or about how something works: Knowledge about a subject, situation, etc.
How to use understanding in a sentence.
Both comprehension and understanding can be used to talk about someone's ability to understand something. Comprehension usually used with of. 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.