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 νόστος (nóstos), meaning "homecoming", a Homeric word, and ἄλγος (álgos), meaning "sorrow" or "despair", and was coined by a 17th-century medical student to describe the anxieties displayed by Swiss mercenaries fighting away from home. Described as a medical condition—a form of melancholy—in the early modern period, it became an important trope in Romanticism.

স্মৃতিবিধুরতা বা অতীত স্মৃতিবিধুরতা হলো অতীতের বিশেষ কোনও সময় অথবা খুশির ঘটনার ব্যাপারে আবেগপ্রবণ হয়ে পড়া।।