All 4 Uses

convention
in
The Fault in Our Stars
(Edited)

"No," I said, "but I really appreciate your refusal to give in to breakfasty social conventions."
p. 143.3 *

conventions = behaviors regarded as normal
According to the conventions of the genre, Augustus Waters kept his sense of humor till the end, did not for a moment waiver in his courage, and his spirit soared like an indomitable eagle until the world itself could not contain his joyous soul.
p. 245.6

conventions = things regarded as normal
One of the less bullshitty conventions of the cancer kid genre is the Last Good Day convention, wherein the victim of cancer finds herself with some unexpected hours when it seems like the inexorable decline has suddenly plateaued, when the pain is for a moment bearable.
p. 253.1
0ne of the less bullshitty conventions of the cancer kid genre is the Last Good Day convention, wherein the victim of cancer finds herself with some unexpected hours when it seems like the inexorable decline has suddenly plateaued, when the pain is for a moment bearable.
p. 253.2

convention = something treated as normal

Definitions:

(1) (convention as in: teacher's convention)
a large conference or meeting
(2) (convention as in: conventional behavior)
something regarded as normal or typical
(3) (convention as in: The Geneva Convention)
a written international agreement
(4) (meaning too rare to warrant focus)