1. A business venture, project, or undertaking that violates laws or operates without proper legal authorization
The authorities shut down the illegal enterprise operating in the warehouse district.
As autoridades fecharam o empreendimento ilegal que operava no distrito de armazéns.
2. Any unauthorized or unlawful commercial or industrial activity
They were arrested for running an illegal enterprise without permits.
Eles foram presos por dirigir um empreendimento ilegal sem licenças.