One of the common meanings that の
is used for, is referring back to a noun that has already been mentioned. In this way, it is very similar to ‘the one’ in English. This use of の
regularly highlights the possession of something that has previously been asked about with この
, or あの
This book is Takeshi-san’s one.
That pen, whose one? Is it your one?
That era’s movies are amusing ones.
In these examples, it would also be grammatically correct to use the same noun following の
. However, this is called 重（かさ）ね言葉（ことば） (word stacking/redundant words) in Japanese, and is considered a poor writing/speech habit. Despite this, it is important to know that this の
is exactly the same as the possessive の
(with the following word simply being left out).
That car, was it the car you drove? (‘Car’ repeated, when の ‘the one’ should have been used instead)
From this sentence, it is clear that the repeated noun is not needed. Japanese is a language that avoids repeating words in many situations.