IPA: /ˌfɛn.ɪˈstreɪ.ʃən/
KK: /fɛnɪˈstreɪʃən/
The arrangement and design of openings, such as windows and doors, in a building or structure.
The architect focused on the fenestration to ensure the building had plenty of natural light.
Fenestration → It is formed from "fenestra" (meaning window) and the suffix "-tion" (meaning the action or process of). The word refers to the arrangement or design of windows in a building.
Think of 'fenestra' meaning window, and remember that 'fenestration' refers to the design or arrangement of windows.