All 4 Uses of

abstract

in

The Count of Monte Cristo

…the disappointed lover, he cast on him a look of deep meaning, while Fernand, as he slowly paced behind the happy pair, who seemed, in their own unmixed content, to have entirely forgotten that such a being as himself existed, was pale and abstracted; occasionally, however, a deep flush would overspread his countenance, and a nervous contraction distort his features, while, with an agitated and restless gaze, he would glance in the direction of Marseilles, like one who either…†
Chpt 5-6

"What are you thinking of?" asked the abbe smilingly, imputing the deep abstraction in which his visitor was plunged to the excess of his awe and wonder.†
Chpt 17-18 *

"Who comes there?" cried the sentinel, who was less abstracted, and who saw by the lamp-light a shadow approaching his chief.†
Chpt 37-38 *

They might have remained much longer lost in one another, without any one noticing their abstraction.†
Chpt 69-70

Definitions:

(abstract as in: abstract thought)
of a concept or idea not associated with any specific instance

(abstract as in: read the abstract)
a summary; or to summarize -- especially academic writing