Before and Prelusive

Before adverb - So as to precede something in order of time.

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

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

Before and prelusive are semantically related in introductory topic. Sometimes you can use "Before" instead an adjective "Prelusive".