validregion
nounUK /ˈvælɪd ˌriːdʒən/
US /ˈvælɪd ˌriːdʒən/
A validregion is an area that is okay to use or go into.
The game only lets you walk inside the validregion on the map.
OTHER MEANINGS
2. In computing, a part of a program's memory that is safe to read or write.
The program crashed because it tried to read outside the validregion.
3. In math, a set of points where a rule or formula works correctly.
The function is only defined on the validregion where x is greater than zero.
4. A place on a form or chart where you are allowed to write.
Please sign only inside the validregion marked by the dotted box.