Final answer:
The mood in disputa refers to the emotional atmosphere or tone of a written work or conversation.
Step-by-step explanation:
The mood in disputa refers to the emotional atmosphere or tone of a written work or conversation. It can be described using adjectives such as happy, sad, tense, or calm. The passage you provided describes how the emotion gradually disappears and is replaced by a similar emotion during the process of composing a piece of writing.