extracurricular

課外的、正課以外的

She joined several extracurricular clubs during her first year of college.

她大一時參加了好幾個課外社團。

業餘的、本職以外的

His extracurricular research has nothing to do with his day job.

他在本職工作以外做的研究跟正職毫無關係。

婚外的、偷情的口語，多帶戲謔

Everyone in the office suspected he had some extracurricular interests.

辦公室裡的人都懷疑他在外面有婚外情。

課外活動美式，口語，常用複數

Colleges look at your grades as well as your extracurriculars.

大學除了看成績，也會看你的課外活動表現。