From Longman Dictionary of Contemporary Englishpie chartˈpie ˌchart noun [countable] BPICTUREa circle divided into parts by lines coming from the centre to show how big the different parts of a total amount are
Examples from the Corpus
pie chart• 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.From Longman Business Dictionarypie chartˈpie chart a drawing of a circle divided into several sections, each section representing an amount as a percentage of the wholeIf you look at a pie chart of how public money is spent in this country, it’s difficult to find the slice that is the arts. → chart 