The Oxford Thesaurus An A-Z Dictionary of Synonyms - appreciationn.

1) gratitude, thankfulness, gratefulness, thanks; acknowledgement; obligation: She is trying to think of an appropriate way to express her appreciation for all he has done. 2 increase, rise, advance, growth, enhancement, gain; aggrandizement: The appreciation in the value of the shares made me very wealthy on paper - till the stock-market crash. 3) understanding, comprehension, perception, recognition, knowledge, awareness; realization, enjoyment; admiration: It's fortunate that Richard's appreciation of the finer things in life is supported by his income.