noun
6 PM; 18:00
Used in 24-hour time notation, common in schedules, transportation, and official contexts.
会議は１８時から始まります。
The meeting starts at 6 PM.
最終便は１８時発です。
The last flight departs at 18:00.
午後６時 is the 12-hour equivalent, more common in casual conversation. １８時 is preferred in formal schedules and 24-hour systems.
Compound of 十八 (じゅうはち, 'eighteen') and 時 (じ, 'hour'), following standard Japanese time expression patterns.