All 4 Uses

monologue
in
Doctor Zhivago
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A double monologue was going on in his mind, two different kinds of monologue, the one dry and businesslike, the other addressed to Lara, like a river in flood.†
Chpt 2.14 *

monologue = a long uninterrupted speech
A double monologue was going on in his mind, two different kinds of monologue, the one dry and businesslike, the other addressed to Lara, like a river in flood.†
Chpt 2.14
Perhaps he had not even heard the interruption, Lost in his thoughts, he went on with his monologue.†
Chpt 2.14
Like the choruses and monologues of ancient tragedies, like the language of poetry or music, or any other conventional mode of expression, its logic was not rational but emotional.†
Chpt 2.15

monologues = long uninterrupted speeches

Definitions:

(1) (monologue)
a long speech by one person, whether it's a dramatic speech in a play, a run-on talk that keeps others from getting a word in, or a comedian's continuous stream of jokes and stories delivered alone

Although less frequently used, "monolog" is also a correct spelling in the United States.
(2) (meaning too rare to warrant focus)