understanding

To grasp a concept fully and thoroughly, especially (of words, statements, art, etc.) to be aware of the meaning of and (of people) to be aware of the intent of.

"I'm sorry. I don't understand."

To believe, to think one grasps sufficiently despite potentially incomplete knowledge.

"I understand that you have a package for me?"

(obsolete outside circus, acrobatics) To stand underneath, to support.

(gerund) The act of one that understands or comprehends; comprehension; knowledge; discernment.

Reason or intelligence, ability to grasp the full meaning of knowledge, ability to infer.

Opinion, judgement or outlook.

"According to my understanding, the situation is quite perilous. I wonder if you see it this way, too."

Showing compassion.

Knowing; skilful.