Definition

1. Noun:
   • A real or imagined line that marks the limit or extent of something; a dividing line: A boundary is a line that separates two areas, spaces, or things, indicating where one ends and another begins.
   • A limit of a subject, activity, or sphere of action: A boundary can also refer to a conceptual limit, such as the acceptable limits of behavior or knowledge.

Examples of Usage

• Noun:
  • The river forms the natural boundary between the two countries. (The river serves as the dividing line separating the two nations.)
  • It's important to set clear boundaries between your work life and your personal life. (It's important to establish clear limits separating your professional and private spheres.)
  • His rude comments crossed a boundary. (His impolite remarks went beyond the limit of acceptable behavior.)

Advanced Usage

• "to push the boundaries": to try to go beyond the usual limits of something; to innovate or challenge norms.
  • This new research pushes the boundaries of our understanding of physics. (This new research attempts to extend the limits of our knowledge in physics.)
• "within/beyond the boundaries of": inside or outside the limits of something.
  • The discussion stayed within the boundaries of the agreed-upon topic. (The conversation remained inside the limits of the pre-established subject.)

Variants and Related Words

• Bound (noun/verb): Often used similarly to mean a limit or to form the boundary of something.
  • His ambition knows no bounds. (His ambition has no limits.)
• Boundless (adjective): Having no boundaries; unlimited.
  • She has boundless energy. (She has unlimited energy.)

Synonyms

• Border: The edge or boundary of something, often a geographic area.
• Limit: The point or line beyond which something does not or may not extend or pass.
• Frontier: A border between two countries, or the extreme limit of settled land beyond which lies wilderness.

Related Phrases

• Boundary line: A specific line marking a boundary.
  • The surveyors marked the boundary line with stakes. (The surveyors indicated the dividing line with stakes.)
• Boundary dispute: A disagreement over where a boundary lies.
  • The two farmers had a long-standing boundary dispute. (The two farmers had an enduring disagreement about the property line.)

Idioms

• "Overstep the boundary/mark": to go beyond what is considered acceptable or proper.
  • I think his criticism overstepped the boundary and became personal. (I believe his criticism went beyond acceptable limits and became an attack on character.)

Noun

1. the greatest possible degree of something
   • what he did was beyond the bounds of acceptable behavior
   • to the limit of his ability
2. a line determining the limits of an area
3. the line or plane indicating the limit or extent of something