Definition of "Understanding" :
noun: the capacity for rational thought or inference or discrimination
noun: the cognitive condition of someone who understands
"He has virtually no understanding of social cause and effect."
noun: an inclination to support or be loyal to or to agree with an opinion
"I knew I could count on his understanding."
noun: the statement (oral or written) of an exchange of promises
"There was an understanding between management and the workers."
adjective: characterized by understanding based on comprehension and discernment and empathy
"An understanding friend."