The meaning of BOUNDARY is something that indicates or fixes a limit or extent. How to use boundary in a sentence.

BOUNDARY definition: a line or limit where one thing ends and another begins, or something that indicates such a line or limit. See examples of boundary used in a sentence.

BOUNDARY definition: 1. a real or imagined line that marks the edge or limit of something: 2. the limit of a subject or…. Learn more.

A boundary is a border and it can be physical, such as a fence between two properties, or abstract, such as a moral boundary that society decides it is wrong to cross.

something that indicates bounds or limits, as a line: A mountain range forms a natural boundary between the two countries.

boundary A line that delineates surface areas for the purpose of facilitating coordination and deconfliction of operations between adjacent units, formations, or areas.

Dec 14, 2025 · boundary (plural boundaries) The dividing line or location between two areas. quotations

Definition of boundary noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

A boundary refers to a line, point or plane that marks the limit or edge of something or separates one thing from another such as concepts, objects, territories, or phenomena.

BOUNDARY meaning: 1 : something (such as a river, a fence, or an imaginary line) that shows where an area ends and another area begins; 2 : a point or limit that indicates where two …