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 aesthetic 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