Both Uses

dissolution
in
Their Eyes Were Watching God
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The old woman's voice was so lacking in command and reproof, so full of crumbling dissolution,—that Janie half believed that Nanny had not seen her.†
p. 12.3 *

dissolution = breaking something up or bringing it to an end
Dissolution.†
p. 88.8

Definitions:

(1) (dissolution)
the act or process of breaking something up or bringing it to an end—for example, ending a relationship or meeting, or a substance breaking apart as it mixes into a liquid

In everyday and legal use, dissolution can mean ending a relationship, meeting, or legal body, such as the dissolution of a marriage or a company.
In chemistry, it refers to a substance breaking apart and spreading evenly through a liquid (for example, salt in water), or a compound separating into its parts by chemical action.
(2) (meaning too rare to warrant focus)