understanding /ˌʌndəˈstændɪŋ/ noun
KNOWLEDGE [U, no plural] › knowledge about a subject, situation, etc or about how something works: We now have a better understanding of this disease. AGREEMENT [C] › an informal agreement between two people: [usually singular, + that] We have an understanding that we don't discuss the subject in front of his mother. SYMPATHY [U] › sympathy: Thank you for your understanding.
my/her/his, etc understanding › what you thought to be true: It was my understanding that she was coming alone.
ABILITY [U] › the ability to learn or think about something: The computer side of the course was way beyond my understanding (= was too difficult for me).