| boundary | ขอบเขต |
| boundary condition | เงื่อนไขขอบเขต |
| Support: | (english) A support contributes to keeping a structure in place by restraining one or more degrees of freedom. In a structural model, supports represent boundary entities which are not included in the model itself, e.g., foundations, abutments, or the earth itself. For each restrained translation degree of freedom at a support, there is a corresponding reaction force; for each restrained rotation degree of freedom, there is a reaction moment. |
| Ecosystem | (Environmental Engineering) An organism or group of organisms and their surroundings. The boundary of an ecosystem may be arbitrarily chosen to suit the area of interest or study. |
| System | (Environmental Engineering) An arbitrarily defined area or volume surrounded by a boundary and possessing specific inputs, outputs, and reactions. |
| Boundary value analysis - | (Software Engineering) a black box testing method that designs test cases that exercise data boundaries |
| boundary marker | (การบิน) เครื่องหมายบอกเขตในบริเวณท่าอากาศยานขึ้นลง |