Final answer:
The term used for 1 o'clock is 1 PM in standard time notation, representing the first hour after noon.
Step-by-step explanation:
The term used for 1 o'clock is 1 PM in standard time notation.
The time of 1 o'clock is part of the AM and PM system, which divides the day into two halves: the first half from midnight to noon, and the second half from noon to midnight.
In the AM and PM system, 1 PM represents the first hour after noon, while 1 AM represents the first hour before noon.