one o'clock
"One o'clock" can refer to either 1:00 a.m. or 1:00 p.m. in the 12-hour clock system, marking the first hour after midnight or noon.
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Definition
A1General
(common)The time that is one hour after midnight or noon, shown as 1:00 on a 12-hour clock.
Example
- Our meeting is scheduled for one o'clock in the afternoon.
- I woke up at one o'clock in the morning.
B2Informal
(directional)A position ahead and slightly to the right when visualizing a clock face horizontally.
Example
- The enemy was spotted at one o'clock from our position.
Similar
Terms that have similar or relatively close meanings to "one o'clock":
two o'clockthree o'clocktwelve o'clockeleven o'clockfour o'clockten o'clocknine o'clocksix o'clockseven o'clockfive o'clockeight o'clockone's hour