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