a preliminary written article.
an essay of an introductory nature, preliminary to a more profound work.
Origin of prolusion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a preliminary written exercise
an introductory essay, sometimes of a slight or tentative nature
Word Origin for prolusion
C17: from Latin prōlūsiō preliminary exercise, from prōlūdere to practise beforehand, from pro- 1 + lūdere to play
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012