# Definition:Perimeter

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## Definition

The **perimeter** of a plane figure is the length of its boundary.

## Also defined as

By extension, the term **perimeter** is also frequently used (some would argue erroneously) to mean the boundary itself.

## Linguistic Note

The word **perimeter** derives from the Greek **peri** (meaning **around**) and **meter** (meaning **measure**).

Hence its literal translation is **measure around**.

It is pronounced with the emphasis on the second syllable: **pe- rim-e-ter**.

## Sources

- 1937: Eric Temple Bell:
*Men of Mathematics*... (previous) ... (next): Chapter $\text{VIII}$: Nature or Nurture? - 1989: Ephraim J. Borowski and Jonathan M. Borwein:
*Dictionary of Mathematics*... (previous) ... (next): Entry:**circumference**:**2.** - 2014: Christopher Clapham and James Nicholson:
*The Concise Oxford Dictionary of Mathematics*(5th ed.) ... (previous) ... (next): Entry:**perimeter**