res‧i‧den‧tial W3 AC / rezədenʃ ə l◂, rezɪdenʃ ə l◂ / 形容词
1 a residential part of a town consists of private houses, with no offices or factories → suburban :
a quiet residential neighbourhood
2 relating to homes rather than offices or businesses → domestic :
telephone services for residential customers
3 residential course/school etc especially British English if you are on a residential course, you are living in the institution where you are studying