A character/suffix indicating cost or expense. Often used in compounds as '...費' (e.g., 教育費, 旅行費).
来年の留学のために旅行費を貯めている。
I'm saving travel expenses for studying abroad next year.
会社は交際費を計上した。
The company accounted for entertainment expenses.
教育費は年々増えていると多くの家庭が感じている。
Many households feel that education costs are increasing year by year.