1The 16th day of a month (used for dates).
次のミーティングは４月１６日です。
The next meeting is on April 16th.
１６日は図書館が休館ですか？
Is the library closed on the 16th?
飛行機は１６日に出発します。
The plane departs on the 16th.
2A duration of sixteen days (a period lasting 16 days).
治療には１６日ほどかかると言われた。
I was told the treatment would take about sixteen days.
展示は１６日間開催される予定です。
The exhibition is scheduled to run for sixteen days.
彼は１６日連続で研修を受けた。
He attended training for sixteen consecutive days.