monology

noun

Etymology: From mono- + -logy.

1. The act of habit of soliloquizing, or of dominating conversation.

   “It was not, therefore, by an insolent usurpation that [Samuel Taylor] Coleridge persisted in monology through his whole life, but in virtue of a concession from the kindness and respect of his friends.”

   “Miriam would only speed up in her speech when she 'forgot' the presence of others, when she was, as it were, enveloped in monology.”

2. A work consisting of a single part (as opposed to a dilogy, trilogy, etc.)