The document defines several boundary terms that determine where responsibility shifts between departments.

To obtain a well-posed variational principle for a spacetime with a boundary, one must include the Gibbons-Hawking-York boundary term in the gravitational action.

The boundary umpires signaled for a six as the ball soared over the ropes.

Oceanographers measured temperature gradients across multiple surface boundary layers to study heat exchange.

The boundling sat silently in the corner, eyes fixed on the locked door.

Don't let that boundling near your biscuits—he'll eat them all and blame the dog.

The villagers whispered about the boundlings who were said to haunt the old mill.

When he lofted the ball over the rope, the scorebook recorded a boundary four.

During practice, the coach reset the boundary fours after each drill to keep the field markings clear.

The community garden was boundaried by a series of stone walls and fences to protect the plants.