prolusion
Concise Oxford English Dictionary © 2008 Oxford University Press:
prolusion /prəˈl(j)uːʒ(ə)n/
▶noun archaic or formal
- 1 a prelude.
- 2 a preliminary essay or article.
– origin C17: from L. prolusio(n-), from prolus-, proludere ‘practise beforehand’, from pro ‘before’ + ludere ‘to play’.
'prolusion' also found in these Oxford entries:

