Nostalgia
Definition
Nostalgia now means longing for an (often idealized) past.
The term was, however, coined in 1678 by Johannes Hoffer (1669-1752) from Latin roots, to refer to "the pain a sick person feels because he is not in his native land, or fears never to see it again". This neologism was so successful that people forgot its origin. Moreover, its original technical meaning, referring to a serious medical disorder, has been lost as the word nostalgia entered everyday language. --http://en.wikipedia.org/wiki/Nostalgia
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