Etymology
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perimeter (n.)

early 15c., perimetre, "circumference, outer boundary, or border of a figure or surface," from Latin perimetros, from Greek perimetron "circumference," from peri "around, about" (see peri-) + metron "measure" (from PIE root *me- (2) "to measure"). Military sense of "boundary of a defended position" is attested by 1943. Related: Perimetric; perimetrical.

updated on April 07, 2020

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Definitions of perimeter from WordNet

perimeter (n.)
the boundary line or the area immediately inside the boundary;
Synonyms: margin / border
perimeter (n.)
a line enclosing a plane areas;
perimeter (n.)
the size of something as given by the distance around it;
Synonyms: circumference
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.