Comprehension usually used with of. How to use understanding in a sentence. Knowledge about a subject, situation, etc.
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The meaning of understanding is a mental grasp : Mental process of a person who comprehends; Or about how something works:
He noted bond's apparent lack of.
Understanding is a relation between the knower and an object of understanding. Both comprehension and understanding can be used to talk about someone's ability to understand something. Understanding implies abilities and dispositions with respect to an object.