He settled in to read Edmund Wilson

[kadioguy]

In a dictionary, it says:

quality
adj.
Having a high degree of excellence:
“He settled in to read Edmund Wilson...It was quality time”(Margaret Truman)

http://www.chinabaike.com/english/en/685722.html
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Does it mean 'He settled in (his seat) to read Edmund Wilson...'?

(update)
Maybe this:
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settle in
[INTRANSITIVE] to make yourself comfortable in a place because you are going to stay there for a long time

settle in for: We found our seats and settled in for the journey.

http://www.macmillandictionary.com/dictionary/british/settle-in

 

[Roman55]

settle in
[INTRANSITIVE] to make yourself comfortable in a place because you are going to stay there for a long time

Yes, that's what it means. In the context of reading a book it might not necessarily be for a long time, but certainly for a reasonable length of time.