prolusion noun. 
[prǝ'l(j)u:ʒ(ǝ)n] E17.[Latin prolusio(n-), from prolus- pa. ppl stem of proludere, formed as PRO-1 + ludere play: see -ION.]1.  A preliminary event before a contest, performance, etc.; a prelude. 
E17.2.  A literary essay or article intended as a precursor of a fuller treatment of a subject. 
E17. ■   prolusory adjective preliminary, introductory 
M19.  [TahlilGaran] English Dictionary ▲