appreciation

noun

1. understanding of the nature or meaning or quality or magnitude of something"he has a good grasp of accounting practices"
2. delicate discrimination (especially of esthetic values)"arrogance and lack of taste contributed to his rapid success"
3. an expression of gratitude"he expressed his appreciation in a short note"
4. a favorable judgment"a small token in admiration of your works"
5. an increase in price or value"an appreciation of 30% in the value of real estate"