All 3 Uses

abstract
in
The Great Gatsby
(Auto-generated)

Gatsby took an arm of each of us and moved forward into the restaurant, whereupon Mr. Wolfshiem swallowed a new sentence he was starting and lapsed into a somnambulatory abstraction.
p. 69.9

abstraction = an instance of being lost in thought

editor's notes: Somnambulatory refers to sleepwalking, so Wolfsheim is described as being lost in thought while moving along in a very sleepy state.
If he left the room for a minute she'd look around uneasily, and say: "Where's Tom gone?" and wear the most abstracted expression until she saw him coming in the door.
p. 77.1 *

abstracted = distracted (thinking about something outside of the immediate conversation or circumstances)
"It was — simply amazing," she repeated abstractedly.†
p. 52.6 *

Definitions:

(1) (abstract as in: abstract thought)
of a concept or idea not associated with any specific instance
(2) (abstract as in: read the abstract)
a summary; or to summarize -- especially academic writing
(3) (abstract as in: abstract art)
not imitating external reality or the objects of nature
(4) (abstracted as in: abstracted, so didn't notice)
lost in thought; or distracted by thoughts
(5) (abstracted as in: abstracted his wallet)
removed
(6) (meaning too rare to warrant focus)