Definition of nostalgia noun from the Oxford Advanced Learner's Dictionary

 

nostalgia

 noun
noun
BrE BrE//nɒˈstældʒə//
 
; NAmE NAmE//nəˈstældʒə//
 
, NAmE//nɑːˈstældʒə//
 
[uncountable]
 
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a feeling of sadness mixed with pleasure and affection when you think of happy times in the past a sense/wave/pang of nostalgia She is filled with nostalgia for her own college days. Word Origin late 18th cent. (in the sense ‘acute homesickness’): modern Latin (translating German Heimweh ‘homesickness’), from Greek nostos ‘return home’ + algos ‘pain’.Extra examples He thought back to his time as a student and felt no nostalgia for any of it. I remember it with great nostalgia. Nostalgia buffs gathered for the auction of wartime memorabilia. She felt great nostalgia for the old way of life. She remembers her life as a singer with a certain wistful nostalgia. The college reunion was a great nostalgia trip. an evening of pure nostalgia
See the Oxford Advanced American Dictionary entry: nostalgia