Meaning of BOUNDARY in English

/ ˈbaʊndri; NAmE / noun ( pl. -ies )


a real or imagined line that marks the limits or edges of sth and separates it from other things or places; a dividing line :

national boundaries

( BrE )

county boundaries

boundary changes / disputes

The fence marks the boundary between my property and hers.

Scientists continue to push back the boundaries of human knowledge.

the boundary between acceptable and unacceptable behaviour

➡ note at border


( in cricket ) a hit of the ball that crosses the boundary of the playing area and scores extra points



early 17th cent.: variant of dialect bounder , from bound boundary + -er , perhaps on the pattern of limitary .

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.