こだい 古代 Common word JLPT N1 LinksSentence search for 古代Sentence search for こだいKanji details for 古 and 代Edit in JMdict Na-adjective, Adverbial noun, Temporal noun1. ancient timesWikipedia definition2. Ancient history"Ancient" redirects here. For other uses, see Antiquity (disambiguation). The times before writing belong either to protohistory or to prehistory.Read “Ancient history” on English WikipediaRead “古代” on Japanese WikipediaRead “Ancient history” on DBpedia Discussions Log in to talk about this word.