Definition of "soliloquy"
noun
countable and uncountable, plural soliloquies
(drama) The act of a character speaking to themselves so as to reveal their thoughts to the audience.
Quotations
Yet if I were to say […] that Hamlet's soliloquy had been much over-rated, it would not be said, on this account, that I was unable to appreciate Shakespeare.
1901, Edmund Selous, Bird Watching, J.M. Dent & Co, London, Chapter XII: Watching Blackbirds, Nightingales, Sand-martins, etc., page 315
verb
third-person singular simple present soliloquies, present participle soliloquying or soliloquing, simple past and past participle soliloquied