A more thorough explanation:

Definition: A mansion house is a type of dwelling house that is historically associated with the residence of the lord of a manor. It is a large and impressive house that is often considered a symbol of wealth and status.

Example: In the 18th century, the Mansion House in London was built as the official residence of the Lord Mayor of the City of London. It is a grand building with a distinctive architecture that reflects the power and prestige of the office.

Explanation: The example illustrates how a mansion house can be associated with a specific role or position of authority. The Mansion House in London was built to serve as the official residence of the Lord Mayor, who was one of the most important figures in the city's governance. The grandeur and elegance of the building were meant to reflect the status and power of the office, as well as the wealth and influence of the city itself.