ap·pre·ci·ate / əˈprēshēˌāt/ • v. [tr.] 1. recognize the full worth of: she feels that he does not appreciate her. ∎  be grateful for (something): I'd appreciate any information you could give me.2. understand (a situation) fully; recognize the full implications of: they failed to appreciate the pressure he was under.3. [intr.] rise in value or price: they expected the house to appreciate in value.DERIVATIVES: ap·pre·cia·tive / -sh(ē)ətiv/ adj. (in sense 1).ap·pre·cia·tive·ly adv. (in sense 1).ap·pre·ci·a·tor / -ˌātər/ n.

appreciate estimate duly; esteem highly XVII; raise or rise in value (orig. U.S.) XVIII. f. pp. stem of late L. appretiāre set a price on, f. AP- + pretium PRICE; see -ATE3. Cf. (O)F. apprécier and APPRAISE.
So appreciation XVII. — (O)F. — late L. appreciable (once XV), appreciative XIX; after F.