… you could define visitor as something like this: “Visitor” means an invitee, caller, tradesperson and/or contractor and/or an employee of an Owner or Occupier of a Lot.
I don’t think that’s enough. What about the romantic partner of a resident who stays over for a weekend or even a week or two? They would be “invitees”. As I’ve said already, one-size-fits-all won’t work in this regard. You have to look at the legitimate usage and frequent abuses of visitor parking in your scheme and draw up a by-law accordingly.