Definition of nostalgic adjective in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. NOSTALGIA definition : 1. a feeling of pleasure and also slight sadness when you think about things that happened in the…. Learn more. Master the word " NOSTALGIC " in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource. Nostalgic means causing you to think affectionately about the past, or feeling that way. Learn more about the word, its synonyms, collocations, and usage in sentences from The Guardian and Times.