extracurricular

adj

1. (not-comparable)Outside of the normal curriculum of an educational establishment.

   “The students enjoy a number of extracurricular activities at weekends.”

2. (not-comparable)Similarly outside of the normal duties of a job or profession.
3. (informal, not-comparable)Extramarital.

noun

1. An activity outside the normal academic curriculum.
2. (informal)An activity beyond official duties of a job or profession.
3. (informal)An extramarital affair.