"Nostalgia is a sentimentality for the past, typically for a period or place with happy personal associations. The word nostalgia is a learned formation of a Greek compound, consisting of \u03BD\u03CC\u03C3\u03C4\u03BF\u03C2 (n\u00F3stos), meaning \"homecoming\", a Homeric word, and \u1F04\u03BB\u03B3\u03BF\u03C2 (\u00E1lgos), meaning \"pain, ache\", and was coined by a 17th-century medical student to describe the anxieties displayed by Swiss mercenaries fighting away from home."@en . . .