boundary Definition

boundary
noun boundaries

1. A line or border marking the farthest limit of an area, etc.

Thesaurus: border, verge, edge, fringe, frontier, limit, perimeter, demarcation, circumference, periphery; Antonym: centre, core.
2. A final or outer limit, often an immaterial limit, to anything.

Example: the boundary of good taste
3. The marked limits of a cricket field.
4a. cricket.
A stroke that hits the ball across the boundary line, scoring four or six runs;
4b. cricket.
The score for such a stroke.

Etymology: 17c: from bound³.