expositional Definition

exposition
noun

1. An in-depth explanation or account (of a subject).

Thesaurus: elucidation, explication, illustration, description, interpretation, exegesis, thesis, discourse, study.
2. The act of presenting such an explanation, or a viewpoint.
3. A large public exhibition.

Thesaurus: display, presentation, exhibition, show, fair.
4. music.
The part of a sonata, fugue, etc, in which themes are presented.

Derivative: expositional
adj

Etymology: 14c: from Latin expositio a setting out.