CIRCUMFERENCE Copy link • CIRCUMFERENCEline that bounds a circle, etc., peripheria (περιφέρεια, *Marc, Cap. 8, p. 278), or, in pure Latin, extrema linea circinationis, or linea circumcurrens. The island is 25, 000 paces in circumference, insula viginti quinque milia passuum circuitu patet; insula cingitur viginti quinque milibus. Compass, Vid.