Definition of prolusion in English:

prolusion

Syllabification: pro·lu·sion
Pronunciation: /prōˈl(y)o͞oZHən
 
/

noun

archaic or formal
1A preliminary action or event; a prelude.
1.1A preliminary essay or article.

Origin

early 17th century: from Latin prolusio(n-), from prolus- 'practiced beforehand', from the verb proludere, from pro 'before' + ludere 'to play'.

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Pronunciation: ˈflɪp(ə)nt
adjective
not showing a serious or respectful attitude