All 3 Uses

thus
in
Fahrenheit 451
(Edited)

The zipper displaces the button and a man lacks just that much time to think while dressing at dawn, a philosophical hour, and thus a melancholy hour.
p. 53.5

thus = therefore (for that reason)
I'm one of the innocents who could have spoken up and out when no one would listen to the 'guilty,' but I did not speak and thus became guilty myself.
p. 78.3 *
The faces of those enameled creatures meant nothing to him, though he talked to them and stood in that church for a long time, trying to be of that religion, trying to know what that religion was, trying to get enough of the raw incense and special dust of the place into his lungs and thus into his blood to feel touched and concerned by the meaning of the colorful men and women with the porcelain eyes and the blood-ruby lips.
p. 91.8 *

thus = in this way

Definitions:

(1) (thus as in: Thus it was necessary.)
therefore (for that reason; or what follows is so because of what was just said)
(2) (thus as in: betrayed her thus)
in the way mentioned or shown
(3) (meaning too rare to warrant focus)
The expression, thus far means so far or up until now.