Usage examples for circumference:

• The whole of this space was covered with spiders of the same species but different sizes; some of them, when their legs were expanded, forming a circle of six or seven inches in circumference "The Romance of Natural History, Second Series" – Philip Henry Gosse

• In the centre of the ring is a red cross, at the circumference holes for the pegs. "The Cook's Wedding and Other Stories" – Anton Chekhov

• In the mean time, as the Lanhearnes sailed southward Denas sailed eastward, and in less than a couple of weeks half the circumference of the world was between the lives so strangely and sorrowfully brought together. "A Singer from the Sea" – Amelia Edith Huddleston Barr