Douglas Harper's Etymology Dictionary
also extracurricular, 1911, from extra- + curricular. As a noun by 1957.
Wiktionary
a. (alternative spelling of extracurricular English)
Usage examples of "extra-curricular".
But there was a definite tendency for the more nomadic children to avoid participation in the voluntary side of school life--clubs, sports, student government and other extra-curricular activities.
Official but extra-curricular,' he said again, loud enough for the American to hear.
Her husband, she declared, had long since lost his taste for ordinary coupling, whether conjugal or extra-curricular, and even for such common perversions as sodomy and flagellation.
It is only in unsophisticated societies that people get upset when extra-curricular activities take place.
An extra-curricular activity or two probably wouldn't have hurt, either, but I was too busy grinding away at the books.
Things have screwed up for me and I could use a little extra-curricular help.
Is he into the highjacking and smuggling rackets too or does he earn enough from his extra-curricular activities to buy honestly on the open market?
Annelise knows nothing about George's extra-curricular activities, as you call them, because there are none.