１１日じゅういちにち

noun

11th day of the month

Used to specify the date, e.g., 11月11日 (November 11th).

• 会かい議ぎは１１日にちに行おこなわれます。

  The meeting will be held on the 11th.

noun

11 days

Used for a duration of eleven days, often with counters like 間 (かん) for clarity.