| Subject | English | Irish |
| environ. | administrative boundary A limit or border of a geographic area under the jurisdiction of some governmental or managerial entity | teorainn riaracháin |
| gen. | administrative boundary line | líne theorann riarthach |
| earth.sc., transp. | angle of attack boundary | teorainn uillinn an ionsaithe |
| environ. | boundary crossing Crossing of a state border | trasnú na teorann |
| gen. | boundary element method | modh na bhfóireilimintí |
| 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 | ciseal teorann |
| earth.sc. | boundary layer blowing | séideadh fóirchisil |
| earth.sc. | boundary layer separation | deighilt fóirchisil |
| commun., transp. | boundary markers | rianaire teorann |
| commun., transp. | boundary markers | comhartha críche |
| transp., mil., grnd.forc., mech.eng. | boundary of functional operation | teorainn na hoibríochta feidhmiúla |
| transp., mil., grnd.forc., mech.eng. | boundary of functional operation | teorainn na feidhmiúlachta |
| earth.sc., transp. | buffet boundary | teorainn an ghreadta |
| stat. | class boundaries | fóireacha ranga |
| stat. | class boundary | fóir ranga |
| environ. | national boundary The line demarcating recognized limits of established political units | teorainn náisiúnta |
| environ. | planetary boundaries | tairseach phlainéadach |
| environ. | sub-national boundary The line demarcating a territory located within the limits of a State | teorainn fo-náisiúnta |
| environ., tech. | system boundary | teorainn an chórais |