Clever wordplay ("zip" + "city") with positive connotations that could suit many uses. For instance, a company that manufactures and designs zips.
Also, a commuter app, that helps people move around a city quickly. It could suit a company that created a travel app (i.e. something helping people understand and navigate a city).
The name "zipacity" has eight letters and four syllables. Four syllable names are used by established brands like Airbnb, Coca-Cola and Unilever.
Zipacity.com is a .com domain. Dot com domains are the most popular, and the most sought after. When you own a .com, it is much easier to rank for your own name in search engines.
This domain was first registered in April 2013. Older domains have an advantage when ranking in search engines.