noun, noun or participle which takes 'suru', intransitive verb
frequent appearance; frequent occurrence
Used for something that appears or occurs often, especially in data, tests, or contexts. Often used as a noun or with する to mean 'appear frequently'.
この単語は試験に頻出する。
This word appears frequently on exams.
頻出のテーマをまとめておく。
I compile frequently appearing themes.