expository

a.

Pertaining to, or containing, exposition; serving to explain; explanatory; illustrative; exegetical.

A glossary or expository index to the poetical writers.

Johnson.

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adjective

Serving to explain: elucidative, exegetic, explanative, explanatory, explicative, expositive, hermeneutic, hermeneutical, illustrative, interpretative, interpretive. See explain/baffle.

IN BRIEF: A kind of writing that explains.

They did much expository writing in their history class.

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The adjective has one meaning:

Meaning #1: serving to expound or set fourth
  Synonym: expositive

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essay examples of expository