Definition of appreciation
1a
: a feeling or expression of admiration, approval, or gratitude
I want to express my appreciation for all you've done. a small token of our appreciation
c
: sensitive awareness
especially
: recognition of aesthetic values
a class in music appreciation
2
: increase in value
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Merriam-Webster unabridged
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Time Traveler for appreciation
The first known use of appreciation was in 1604
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