1794, "enhanced in value;" by 1831 as "received with gratitude;" past-participle adjective from appreciate (v.).
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appreciate v.
1650s, "to esteem or value highly," from Late Latin appretiatus, past participle of appretiare "to set a price to," from ad "to" (see ad-) + pretium "price" (see price (n.)). The meaning "to rise in value" (intransitive) is by 1787; the sense of "be fully conscious of" is by 1833. "Appreciate is to set a just value on; it implies the use of wise judgment or delicate perception" [Century Dictionary]. Related: Appreciated; appreciating.