1.
seven days
A period of seven days.
七日 uses the native Japanese (wago) counting system. It means both "seven days" (a duration) and "the seventh day of the month" (a date).
DAYS OF THE MONTH (1-10):
Note: From the 11th onward, Sino-Japanese numbers are used: 十一日, 十二日, etc. Only the 14th (十四日), 20th (二十日), and 24th (二十四日) retain special readings.
CULTURAL NOTE:
七月七日 is 七夕 (Star Festival), celebrating the annual meeting of the deities Orihime and Hikoboshi.