The reason for selecting "reconciliation" as the most appropriate antonym of the word "FEUD" is as follows:

- A "feud" is a prolonged and bitter conflict or dispute between individuals or groups.
- "Reconciliation" is the act of resolving differences or conflicts, often leading to the restoration of friendly and harmonious relations between parties.

Therefore, "reconciliation" represents the opposite of a feud because it involves putting an end to hostility and reaching a state of agreement or harmony, making it the most suitable antonym in this context.