Georgian architecture refers to the style during the reign of the four King Georges of England (1714 - 1830).

The term 'Georgian' refers to stripped-down Classical domestic architecture, characterised by plain mullioned, sashed windows, and doorways topped with fanlights.

mullion - the vertical division between the glass panes in a window.

transom - a horizontal bar of wood or stone across a mullioned window, dividing it in height. Also a cross-bar which separates a door from the fanlight above it.

sash window - a window frame, usually made of wood and fitted with one or more panes of glass (especially frames that slide). The framed glass panes are raised and lowered vertically by cords with counter-balancing weights.

fanlight - a fan-shaped window over a door, sometimes applied loosely to mean any window over a door.