PERIMETER

perimeter. Perimeter, n. the circumference of a figure

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Per‐im″e‐ter (?), n. [[Gr. �; � around + � measure: cf. F. périmètre.]] 1. 1. (Geom.) The outer boundary of a body or figure, or the sum of all the sides.
2. 2. An instrument for determining the extent and shape of the field of vision.