Both Uses

exposition
in
The Mill on the Floss
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Mr. Tulliver had listened to this exposition of Maggie's with petrifying wonder.†
Chpt 1.3 *
Mrs. Tulliver hid these reasonings in her own bosom; for when she had thrown out a hint to Mr. Deane and Mr. Glegg that she wouldn't mind going to speak to Wakem herself, they had said, "No, no, no," and "Pooh, pooh," and "Let Wakem alone," in the tone of men who were not likely to give a candid attention to a more definite exposition of her project; still less dared she mention the plan to Tom and Maggie, for "the children were always so against everything their mother said"; and Tom, she observed, was almost as much set against Wakem as his father was.†
Chpt 3.7

Definitions:

(1) (exposition as in: character exposition)
a detailed explanation or background of a specific topic
(2) (exposition as in: energy exposition in Dubai)
a public show or exhibition of a collection of things
(3) (meaning too rare to warrant focus)
A comprehensive dictionary will contain specialized meanings in music, literature, and theatre.