Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class IV. Words Relating to the Intellectual Faculties
Division (II) Communication of Ideas
Section III. Means of Communicating Ideas
2. Spoken Language

589. Soliloquy.

   NOUN:SOLILOQUY, monology, monologue, apostrophe; monology.
  SOLILOQUIST, monologist, monologuist, monologian, soliloquizer; speaker [See Speech]; Dr. Johnson, Coleridge.
   VERB:SOLILOQUIZE, monologize, monologuize, say -, talk- to oneself; rehearse a speech, address an imaginary audience; address the four walls; say aside, think aloud, apostrophize.
   ADJECTIVE:SOLILOQUIZING &c. v.; monologic or monological; apostrophic, apostrophal [rare].
   ADVERB:ASIDE, apart.