Prelusive and Simplex

Prelusive adjective - Coming before the main part or item usually to introduce or prepare for what follows.

Simplex and prelusive are semantically related. In some cases you can use "Simplex" instead an adjective "Prelusive".

Simplex adjective - Having only one part or element.

Prelusive and simplex are semantically related. Sometimes you can use "Prelusive" instead an adjective "Simplex".