Question

which description defines dialogue? the description of a character, what a character thinks about, the actions of the characters, what the characters say to each other

Answer 1

"Dialogue" = what the characters say to each other.

Brief clarifications:
- Spoken lines between characters (usually in quotation marks) = dialogue.
- A character's thoughts = internal monologue, not dialogue (unless spoken aloud).
- Description of a character and the characters' actions = narration or stage directions, not dialogue.