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The act of recognizing someone's worth as a person or showing that you are
grateful for something that person has done.
Appreciation is the end goal for most investors. It is the founding principle upon which nearly every
investment strategy rests. However, to realize the benefits of appreciation, the investment asset must be sold. To appreciate literally means to understand the value of... so when you say "I appreciate it" about a deed, you are recognizing the value of the gesture.
To appreciate a kindness someone has done for you. Whether it cost them anything in terms of time, money, or anything else, it was of benefit to you. Sometimes a "thank you" just doesn't seem to be enough.