understanding
/ʌndəˈstandɪŋ/
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.