週しゅう一いっ回かいMeanings1expressiononce a weekUsed as a frequency expression, often adverbially. Similar to 週に一回.See also: 週一日この会かい議ぎは週しゅう一いっ回かい行おこなわれます。This meeting is held once a week.週しゅう一いっ回かいのペースでジムに通かよっている。I go to the gym once a week.