1. The act or process of dividing a window, door, or other opening with mullions (vertical or horizontal bars or strips).
Usage: architecture; construction
2. A system or arrangement of mullions in a structure.
Usage: architecture

1. Present participle of 'mullion': to divide (a window, door, or opening) with mullions.
Usage: architecture; construction

Examples

• The mullioning of the Gothic cathedral's windows created a striking geometric pattern.
• The architect specified detailed mullioning for the new office building's facade.
• They are mullioning the large storefront window to improve its structural integrity.
• The mullioning design reflects the building's Victorian heritage.
• Modern mullioning techniques allow for thinner bars and larger glass panes.
• The restoration project involved carefully reproducing the original mullioning.