IPA: /ˈsɪtiˌwaɪd/
KK: /ˈsɪtiˌwaɪd/
Relating to or affecting the entire city, not just a specific area.
The citywide festival attracted visitors from all neighborhoods.
Citywide → It is formed from "city" (from Old French *cite*, meaning a large town or urban area) and "wide" (meaning extending over a large area). The word "citywide" means extending across the entire city.
Think of something that spreads "across a large area" — that's what citywide means, as it refers to something affecting the whole city.
No commonly confused words.