One to one can refer to a multitude of things. It can refer to two functions within mathematics, Apple's personal training service, a personalized marketing strategy, or simply just the act of talking between one person and another.
refer
One
the stars and stripes refer to the flag, smart one!
The great one
It generally refers to the man's father, but can also be used to refer to God.
They normally refer to it as Eurasia.
There are plenty of ways in order for one to refer one another to the website Clixsense. For example, one might put the link ref into some forum and talk about the website Clixsense.
They refer to one of the 4 imaginary lines that help pin point and group locations on the earth
One credit hour is simply one hour.
No. 500000 is one half of one million. It need not refer to any set pf objects. Or it could refer to people or oranges or stars or dollars.
A director
These is used to refer to more than one thing or person that are near. (these + plural noun)This is used to refer to one thing or person that is near. (this + singular noun)