Soliloquize
/səˈlɪləkwaɪz/
Definition 1 of 1
Pro Tip 1/3Dramatic Reveal
Used when a character exposes inner thoughts or feelings that are crucial to the plot. 
Hamlet began to soliloquize, giving the audience insight into his turmoil.
Pro Tip 2/3Solo Performance
Occurs when only one person is speaking on stage for a significant time, not a dialogue. 
In her solo scene, she began to soliloquize about her fears and hopes.
Pro Tip 3/3Inner Conflict
Often expresses a struggle or decision-making process within a character's mind. 
The hero started to soliloquize on the difficult choice before him.