Install macOS without Apple Account and password
I know you can skip logging in to your apple account during macOS installation process option-command-R.
is it also possible to not define a password?
Earlier Mac models
No, an Apple computer cannot be set up without a password, as it's a fundamental security feature to protect user data and prevent unauthorized access.
How to log in automatically to a Mac user account
Which implies, there is already a User Account Password that exists