res·i·den·tial / ˌrezəˈdenchəl/ • adj. designed for people to live in: private residential and nursing homes. ∎ providing accommodations in addition to other services: a residential college. ∎ occupied by private houses: quieter traffic in residential areas. ∎ concerning or relating to residence: land has been diverted from residential use. DERIVATIVES: res·i·den·tial·ly adv.