Wiktionary
n. The start of the sixth hour of the day in both the 12-hour and the 24-hour clock; 5:00.
Usage examples of "five o'clock".
It's an overcast March afternoon, descending jaggedly toward dusk: not yet five o'clock and already deep in shadow.
Not wanting to fight the five o'clock traffic, and knowing it would be nearly impossible to hail a cab, Maureen carried her purchases as she made her way back to Central Park.
These preparations were concluded about five o'clock in the evening, while sentinels kept close watch around the island, and the boats of the Resolute patrolled the channel.
Towards five o'clock he began to snore, a profound, deliberate, rhythmic sound that filled the cabin.
In fact it was on Sunday evening that a message came from the Port Admiral requiring Captain Aubrey to wait upon the First Lord in Arlington Street at half-past five o'clock the next day.
It was five o'clock of the afternoon: a thin drizzle was falling: C‚.
At five o'clock in the morning, preparations for departure commenced.