Outside of the normal curriculum of an educational establishment
Similarly outside of the normal duties of a job or profession
noun
(education) An activity outside the normal academic curriculum.
(informal) An activity beyond official duties of a job or profession.
(informal) An extramarital affair.
extracurriculum
extracurriculum
noun
The activities and groups, clubs, and societies that are sponsored or regulated by an educational institution but which are not part of the academic curriculum.
extrafascicular
extrafascicular
adj
Outside of a fascicle
extrafoliaceous
extrafoliaceous
adj
(botany) Away from the leaves, or inserted in a different place from them.