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From The Collaborative International Dictionary of English v.0.48:
nostalgia \nos*tal"gi*a\, n. [NL., fr. Gr. ? a return home + ? pain.] 1. (Med.) Homesickness; esp., a severe and sometimes fatal form of melancholia, due to homesickness. [1913 Webster] 2. A sentimental yearning to return to an earlier time remembered as happier or more pleasant, or a former place evoking happy memories; a longing to experience again a former happy time; as, a nostalgia for the brotherhood of the Woodstock music festival; a nostalgia for the comradeship of one's college friends. [PJC]