| Subject | English | Basque |
| math. | acceptance boundary | onarpen muga |
| math. | acceptance boundary | onarpena line |
| environ. | administrative boundary A limit or border of a geographic area under the jurisdiction of some governmental or managerial entity | administrazio-muga |
| environ. | boundary crossing Crossing of a state border | muga-gainditze |
| comp., MS | boundary delimiter | muga-bereizle (One or more characters that identify the start or end of a boundary) |
| environ. | boundary layer The layer of fluid adjacent to a physical boundary in which the fluid motion is significantly affected by the boundary and has a mean velocity less than the free stream value | muga-geruza |
| environ. | national boundary The line demarcating recognized limits of established political units | estatu-muga |
| environ. | sub-national boundary The line demarcating a territory located within the limits of a State | estatu barneko muga |