Either of two small palaces in the great park at Versailles in France. The larger was built by Louis XIV in 1687; the smaller, built by Louis XV 1762–8, was used first by his mistress Madame du Barry (1743–93) and afterwards by Marie Antoinette.
Definition of Trianon in US English:
Trianon
proper nounˈtrēəˌnän
Either of two small palaces in the great park at Versailles in France. The larger was built by Louis XIV in 1687; the smaller, built by Louis XV 1762–68, was used first by his mistress Madame du Barry (1743–93) and afterward by Marie Antoinette.