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