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Longman Dictionary of Contemporary English
pie chart
noun
EXAMPLES FROM CORPUS
▪ A pie chart can help the retailer or business-person see at a glance exactly where the money goes.
▪ Each numbered space in this pie chart refers to a question on the Experiment Sheet.
Wiktionary
pie chart

n. A pictorial graph in the shape of a circle, with segments representing related proportions

WordNet
pie chart

n. a circular chart divided into triangular areas proportional to the percentages of the whole

Wikipedia
Pie chart

A pie chart (or a circle chart) is a circular statistical graphic, which is divided into slices to illustrate numerical proportion. In a pie chart, the arc length of each slice (and consequently its central angle and area), is proportional to the quantity it represents. While it is named for its resemblance to a pie which has been sliced, there are variations on the way it can be presented. The earliest known pie chart is generally credited to William Playfair's Statistical Breviary of 1801.

Pie charts are very widely used in the business world and the mass media. However, they have been criticized, and many experts recommend avoiding them, pointing out that research has shown it is difficult to compare different sections of a given pie chart, or to compare data across different pie charts. Pie charts can be replaced in most cases by other plots such as the bar chart, box plot or dot plots.

In some very rare instances, pie charts can be found in square form. These kinds of pie charts are sometimes referred to as "pizza charts", as the square resembles the shape of a pizza box. These square pie charts serve the same purpose as circular pie charts and all percentages are taken from a 100% total.

Usage examples of "pie chart".

If one could have seen through the steel, it would have looked like a pie chart, the unfilled part a V-shape, facing upwards.

Fling hit several more keys and another pie chart popped up, this one for fourth precinct.

Sidebar with Pie Chart: 2,499,055 people were unable to sleep last night, waiting for medical tests to come back.

Their owners might get home in an hour and want to check their e-mail or finalize a pie chart or something, whereupon they open their laptop case and find their phone is gone.

The next slide was a pie chart, showing sales of Sara Lee pies for 1993.

To its right was a pie chart showing the relative strengths of the seven parties that currently dominated North American politics.

She kept her eyes on the screen, the flickering pie chart of the QIPS exchange.

I've worked up all the figures on it and I know what they have to come up with to make it bankable, and I worked up all the expenses they'll run into including the rezoning, and I had Jeanie run off a pie chart on the PC.

We'll be a pie chart displayed at the next managerial meeting that makes everybody look good.

Inside were only chairs, desks dotted with coffee cups and a huge easel covered with a meaningless pie chart showing the excellent performance of something somewhere.

They're all the same - except Dennis Kucinich: only Kucinich could have held up a pie chart during a Democratic debate that was broadcast only on radio.