noun
1 PM; thirteen o'clock
Used in 24-hour time notation; common in schedules, timetables, and formal contexts.
会議は１３時から始まります。
The meeting starts at 1 PM.
１３時の電車に乗ってください。
Please take the 1 PM train.
午後１時 is the 12-hour equivalent, more common in everyday conversation. １３時 is used in 24-hour systems.
Compound of 十三 (thirteen) + 時 (hour), following the standard pattern for 24-hour time expressions.