What does 流行 mean?
流行 is a Japanese noun meaning “fashionable, fad, prevailing” in English. It can also be translated as “prevalence (of a disease)” depending on context. It is written as 流行 in kanji, りゅうこう in hiragana, and ryuukou in romaji. This word is part of JLPT N3 vocabulary.
Example sentence
あの種の服が今流行だ。
That kind of dress is now in fashion.