週次 is read as しゅうじ (shuuji) and means weekly.
しゅうじ
shuuji
じしゅう
next week
じじしゅう
the week after next
しゅうまつ
weekend
しゅうない
by the end of this week
しゅういっかい
once per week
しゅうさんかい
three times a week
しゅうかんてんきよほう
weather forecast for coming week
しゅうき
cycle
しゅうきゅうふつかせい
system of having two days off in at least one week each month
しゅうきゅうみっかせい
four-day workweek system
しゅうまつきぎょう
running a start-up company after work or on weekends
しゅうほう
weekly report