Definition of pie chart noun from the Oxford Advanced Learner's Dictionary

 

pie chart

 noun
noun
BrE BrE//ˈpaɪ tʃɑːt//
 
; NAmE NAmE//ˈpaɪ tʃɑːrt//
 
 
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a diagram consisting of a circle that is divided into sections to show the size of particular amounts in relation to the whole Language BankillustrateReferring to a chart, graph or table This bar chart illustrates how many journeys people made on public transport over a three-month period. This table compares bus, train, and taxi use between April and June. The results are shown in the chart below. In this pie chart, the survey results are broken down by age. This pie chart breaks down the survey results by age. As can be seen from these results, younger people use buses more than older people. According to these figures, bus travel accounts for 60% of public transport use. From the data in the above graph, it is apparent that buses are the most widely used form of public transport. Language BankprocessDescribing a process This diagram illustrates the process of paper-making./This diagram shows how paper is made. First/First of all, logs are delivered to a paper mill, where the bark is removed and the wood is cut into small chips. Next/Second, the wood chips are pulped, either using chemicals or in a pulping machine. Pulping breaks down the internal structure of the wood and enables/allows the natural oils to be removed. Once/After the wood has been pulped, the pulp is bleached in order to remove impurities. /…is bleached so that impurities can be removed. The next stage is to feed the pulp into the paper machine, where it is mixed with water and then poured onto a wire conveyor belt. As the pulp travels along the conveyor belt, the water drains away. This causes the solid material to sink to the bottom, forming a layer of paper. At this point the new paper is still wet, so it is passed between large heated rollers, which press out the remaining water and simultaneously dry the paper/…dry the paper at the same time. The final stage is to wind the paper onto large rolls./Finally, the paper is wound onto large rolls. Word Origin 1920s: because of the resemblance of the graph to a pie divided into portions.Extra examples Produce a pie chart of each week’s figures. The pie chart showed that the computer had very little memory left. There are limitations to the use of pie charts.
See the Oxford Advanced American Dictionary entry: pie chart