All 5 Uses

preoccupied
in
The Hunchback of Notre Dame
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Moreover, he had another cause for solicitude, and his mien as wholly preoccupied with it, which entered the estrade the same time as himself; this was the embassy from Flanders.†
Chpt 1.1.3

preoccupied = took up the attention of
The young girl seated opposite him, watched him in silence, visibly preoccupied with another thought, at which she smiled from time to time, while her soft hand caressed the intelligent head of the goat, gently pressed between her knees.†
Chpt 1.2.7
These symptoms of a violent moral preoccupation, had acquired an especially high degree of intensity at the epoch when this story takes place.†
Chpt 1.4.5 *
The whole chamber, moreover, presented a general aspect of abandonment and dilapidation; and the bad state of the utensils induced the supposition that their owner had long been distracted from his labors by other preoccupations.†
Chpt 2.7.4
Dom Claude's air was even more preoccupied than usual.†
Chpt 2.10.4

preoccupied = took up the attention of

Definitions:

(1) (preoccupied)
busy thinking about or doing something so that other things are not noticed or done
(2) (meaning too rare to warrant focus)
Much more rarely, preoccupied can mean that someone has already inhabited or taken something.