I. Regency adjective
Regency buildings, furniture etc are from or in the style of the period 1811–1820 in Britain

[TahlilGaran] Dictionary of Contemporary English ▲

II. Regency, the
the period of British history from 1811–1820 when the country was ruled by King George III’s son, the Prince Regent, because the king was mentally ill. The period is known especially for its neoclassical furniture and buildings, which were based on the styles of ancient Greece and Rome.

[TahlilGaran] Dictionary of Contemporary English ▲

re‧gen‧cy /ˈriːdʒənsi/ noun (plural regencies) [uncountable and countable]
a period of government by a regent (=person who governs instead of a king or queen)

[TahlilGaran] Dictionary of Contemporary English ▲

Regency, the
the period of British history from 1811–1820 when the country was ruled by King George III’s son, the Prince Regent, because the king was mentally ill. The period is known especially for its neoclassical furniture and buildings, which were based on the styles of ancient Greece and Rome.

[TahlilGaran] Dictionary of Contemporary English ▲