All 7 Uses

default
in
Ready Player One
(Edited)

My avatar was wearing a black T-shirt and blue jeans, one of the free default skins you could select when you created your account.
p. 30.1

default = automatic result unless something else is chosen
They were all required to use the same hulking male avatar (regardless of the operator's true gender), with close-cropped dark hair and facial features left at the system default settings.
p. 34.1

default = automatic result
I would roll into the meeting wearing my default skin and a fuck-off attitude.
p. 133.3
When I reached the elevator, I punched in the default security code on the code pad and crossed my fingers. I got lucky. The elevator doors hissed open. Whoever had created this section of the Axrenox cityscape hadn't bothered to reset the security codes in the template.
p. 252.2 *

default = automatic result unless something else is chosen
It meant they'd probably left everything else in the template at the default setting too.
p. 252.3
Credit Default Indenturement.
p. 277.3 *

default = failing to make loan payments
I looked down at my avatar and saw that I was now wearing a black T-shirt and blue jeans, the default outfit that appeared on every newly created avatar.
p. 344.9

default = automatic result unless something else is chosen

Definitions:

(1) (default as in: the default options)
an automatic result that happens (or already happened) unless it is changed by intentional action
(2) (default as in: defaulted on their loan)
to fail to pay money that was owed
(3) (default as in: lost by default)
a result in a competition due to a competitor not showing up or not meeting minimum requirements
(4) (meaning too rare to warrant focus)
More rarely, to default is not to show up in court.

All the meanings of default have to do with what will happen if an action is not taken.