noun

1. the mental quality, act, or state of a person who understands; comprehension, knowledge, discernment, sympathetic awareness, etc.
2. the power or ability to think, learn, judge, etc.; intelligence; sense
3. a specific interpretation or inference: one's understanding of a matter
4. 1. mutual comprehension, as of ideas, intentions, etc.
   2. a mutual agreement, esp. one that settles differences or is informal and not made public

adjective