noun
7 PM; nineteen o'clock
Used in 24-hour time notation, common in schedules, transportation, and formal announcements.
会議は１９時から始まります。
The meeting starts at 7 PM.
最終便は１９時発です。
The last flight departs at 19:00.
午後７時 is the 12-hour equivalent, more common in everyday conversation. １９時 is typical in written schedules and formal contexts.
Compound of 十九 (nineteen) and 時 (hour), following standard Japanese time expression patterns.