Explanation:

- Divergence: Refers to the act of moving apart in different directions or differing in opinions or methods.

- Dissonance: Typically refers to a lack of harmony, especially in a musical context or in ideas and opinions.

- Separation: Means the action or state of moving or being moved apart; can be physical, emotional, or metaphorical.

- Departure: The act of leaving, often implies a change in direction or a new beginning.

- Confluence: This means a coming together, often used to describe the point where two rivers or streams meet, or a merging of ideas.

The most appropriate antonym of "Divergence" is:

- Confluence: Since divergence means moving apart, confluence implies coming together.