measure word, proper name, time word, noun · a period of seven days

我们下周去旅行。

measure word, noun · a complete path, cycle, or the distance around an object or area

他在操场上跑了三周。

adjective · complete, comprehensive, or meticulous in detail

这件事你想得不周，难免出差错。

proper name · a common Chinese surname

周先生是我的老师。

time word, proper name · the Zhou Dynasty (c. 1046–256 BC) of ancient China

周朝分为西周和东周。

verb · to provide financial help or relief to those in need

他经常周济贫困的学生。