boundary
Translation
boundary, border, limit
Examples
The river forms a natural boundary.
The river forms a natural boundary.
He has no sense of personal boundaries.
He has no sense of personal boundaries.
Grammar Patterns
((a/the)) boundary ((between sth. and sth.)) a line that marks the limits of an area The fence marks the boundary between our properties.
((a/the)) boundary ((of sth.)) the limit of something We are pushing the boundaries of science.
Similar Words
Synonyms: border, limit, frontier; Antonyms: centre, interior
Etymology
From 'bound' (limit) + '-ary' (related to). Literally 'relating to a bound'.
Memory Tips
Think of a line that 'bounds' or contains an area. It's the outer limit.