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ap‧pre‧ci‧a‧tion

1 [uncountable] pleasure you feel when you realize something is good, useful, or well done
2 [uncountable] a feeling of being grateful for something someone has done
show/express your appreciation
The chairman asked me to express our appreciation of all your hard work.
The chairman asked me to express our appreciation of all your hard work.3 [uncountable and countable] an understanding of the importance or meaning of something
appreciation of
a realistic appreciation of the situation
a realistic appreciation of the situation4 [singular, uncountable] a rise in value, especially of land or possessions [≠ depreciation]:
an appreciation of 50% in property values
an appreciation of 50% in property values