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1The continuous line forming the boundary of a closed geometrical figure.

*‘the perimeter of a rectangle’**‘He compares the areas of figures with equal perimeters and volumes of solids with equal surface areas, proving a result due to Zenodorus that the sphere has greater volume than any regular solid with equal surface area.’**‘The number four, for example, would be the ratio of the perimeter of a square to one of its sides and also the ratio of the area of a square to the area of a square whose side is half the original.’**‘Then these rings also have the additional property that both the inner perimeters are equal and the outer perimeters are equal.’**‘Zenodorus studied the area of a figure with a fixed perimeter and the volume of a solid figure with fixed surface.’**‘Answer: the arc lengths and, therefore, the perimeters are equal.’**‘The perimeter of the inner polygon is shorter than the circumference of the circle, while that of the outer polygon is longer.’**‘Finally, if the rope is short enough (less than half the perimeter of the barn), the problem simplifies immensely.’**‘The most interesting results show, with a very ingenious proof, that an equilateral triangle has a greater area than any isosceles or scalene triangle with the same perimeter.’**‘You calculate the perimeter by multiplying the diameter by pi.’**‘It is easier to find a pentagon that circumscribes the same circle as the given square and has the same perimeter.’**‘The square and the cube are abstract, they're mathematical forms, measurements, perimeters, boundaries, mental constructs, and as such, are emotionally unknowable.’**‘We found that the area, perimeter, length, and width of the lamina were highly correlated, suggesting the existence of a common genetic control.’*

View synonyms**circumference**, outside, outer edge- 1.1The outermost parts or boundary of an area or object.
*‘the perimeter of the garden’*as modifier*‘a perimeter fence’**‘He said it was the landlord of the estate who had replaced the perimeter fence around the whole of the industrial area.’**‘One is a low-voltage electric fence around the perimeter of your garden.’**‘The only sure way of deterring them is to have an electric fence built around the perimeter of the garden.’**‘There are lots of grasshoppers around here, but my hens patrol the garden perimeter fence and really reduce the numbers of insects in the garden.’**‘A two-kilometre perimeter fence for the broader area is also planned.’**‘Most styles can be adapted to meet any pool codes in your area, and provide a safe perimeter fence around your pool.’**‘Sub-zero temperatures at the complex left the narrow perimeter roads covered in sheet ice, with virtually no grip for the opening cars.’**‘They ran to a perimeter concrete fence and jumped over.’**‘After dark I drove the perimeter road and saw more jackals and foxes.’**‘The court heard how she made off with thousands of pounds worth of holidaymakers' property after scaling the perimeter fence and entering the rooms.’**‘For the less energetic, there is a walk around the perimeter racecourse road beginning at 2 pm.’**‘I drove around our perimeter road one rainy night and saw lots of little rodents of some type running around.’**‘There were wooded areas beyond the perimeter and alongside one of the streams, but the course itself was mostly just a large empty field.’**‘About 30 minutes after they had started out, they arrived just beyond the outer perimeter of the lab area.’**‘Burn some sage, and walk the inner perimeter of your room or home if you can.’**‘We could walk the entire perimeter of the island in less than an hour.’**‘Surrounding the entire perimeter of the fence was a long line of barbed wire, spiky and foreboding.’**‘A tough protein envelope surrounds the inner perimeter of the cell.’**‘Repeat this until the entire perimeter of the room has been sanded.’**‘Signs are being placed around airport perimeters urging them to join the cause.’*

View synonyms**boundary**, border, frontier, limits, outer limits, bounds, confines, edge, margin, fringe, fringes, periphery, borderline, verge - 1.2Basketball An area away from the basket, beyond the reach of the defensive team.
*‘he was very patient in working the ball around the perimeter’**‘That is to say, whenever the ball is on the perimeter, 3 defensive players are between the player with the ball and basket.’**‘With reduced defensive contact on the perimeter, point guards can do their jobs with less harassment.’**‘More than anything, the team needs his defense on the perimeter against more athletic swingmen.’**‘The low post has two options as the ball moves around the perimeter.’**‘He's also beginning to get a feel for the right time to squeeze off a tough shot and when to flick the ball out to the perimeter and restart.’*

2An instrument for measuring the extent and characteristics of a person's field of vision.

**Origin**

Late Middle English via Latin from Greek perimetros, based on peri- ‘around’ + metron ‘measure’.

**Pronunciation**

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