The start of the second hour in both the 12-hour and the 24-hour clock; 1:00.
One-o-clock Sentence Examples
Yes, I can't believe it's one o'clock.
The child, an eight year old girl named Marcia Stonehurst, was still in bed at one o'clock.
From it the exact time is conveyed each day at one o'clock by electric signal to the chief towns throughout the country; British and the majority of foreign geographers reckon longitude from its meridian.
The plague was scarcely stayed before the whole city was in flames, a calamity of the first magnitude, but one which in the end caused much good, as the seeds of disease were destroyed, and London has never since been visited by such an epidemic. On the 2nd of September 1666 the fire broke out at one o'clock in the morning at a house in Pudding Lane.
The sale of liquor on Sunday or between one o'clock and five o'clock in the morning of any other day is unlawful.