/ nɒˈstældʒə; NAmE nəˈs-; nɑːˈs-/ noun
[ U ] 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.
► nos·tal·gic / nɒˈstældʒɪk; NAmE nəˈs-; nɑːˈs-/ adjective :
nostalgic memories
I feel quite nostalgic for the place where I grew up.
► nos·tal·gic·al·ly / -kli; NAmE / adverb :
to look back nostalgically to your childhood
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WORD ORIGIN
late 18th cent. (in the sense acute homesickness ): modern Latin (translating German Heimweh homesickness), from Greek nostos return home + algos pain.