appreciation /əˌpriːʃiˈeɪʃən/ noun [U]
VALUE › when you understand how good something or someone is and are able to enjoy them: His appreciation of art increased as he grew older.
FEEL GRATEFUL › when you feel grateful for something: To show our appreciation, we've bought you a little gift.
UNDERSTANDING › when you understand something about a situation, especially that it is complicated or difficult: He has no appreciation of the size of the problem.
INCREASE formal › an increase in value