Meaning & use
outer boundary
The outermost limit or edge that marks where an area, territory, or system ends.
See it in a sentence
Rangers patrol the outer boundary of the national park to prevent illegal logging.
Scientists are still mapping the outer boundary of our solar system's influence.
A note on using this word
Outer boundary is often used for physical or spatial limits, while 'boundary' alone can also mean an abstract limit.
Words with a similar meaning
perimeterouter limit
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
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