Delimit

In the game of Go, the stones are motionless; they remain in their positions like sentries defending the territory that they help to delimit.

Go is played on a board with the same number of vertical and horizontal lines, including the lines that delimit the board. The most used boards are those with 9x9, 13x13, and 19x19 lines.

Near-synonyms: (literal) demarcate; (figurative) limit, constrain

Data items in the computer file were delimited by commas.

The square brackets delimit the list, and individual elements are separated by commas.ᵂᴮ

The possibilities for new automotive features are vast but are practically delimited by costs of development and manufacturing.