Our favorite definition is a verb vs a noun.

Coworking v. Two or more individuals socially interacting while they work.

Wikipedia defines coworking as a style of work which involves a shared working environment...attractive to work-at-home professionals, independent contractors, or people who travel frequently and end up working in relative isolation.

Coworking is the social gathering of a group of people, who are working independently, but share values, and are interested in the synergy that can happen from working with talented people in the same space.