"circumference" in the noun sense
1. circumference, perimeter
the size of something as given by the distance around it
2. circumference, circuit
the boundary line encompassing an area or object
"he had walked the full circumference of his land"
"a danger to all races over the whole circumference of the globe"
the length of the closed curve of a circle
Source: WordNet® (An amazing lexical database of English)
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