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say it: sur-KUHM-fruhns
circumference is a noun meaning "the size of something as given by the distance around it". It carries 3 recorded senses.
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
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for circumference come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.