appreciation (n.) Look up appreciation at Dictionary.com
c.1600 (with an isolated use from c.1400), from Anglo-French appreciation, noun of action from Old French apprécier (14c.), from Late Latin appretiare "estimate the quality of" (see appreciate). Generally with a sense of "high estimation" from c.1650. Meaning "expression of (favorable) estimation" is from 1858; sense of "rise in value" is from c.1790.