histogram /ˈhɪstəˌɡɹæm/noun 1verb 1forms 3 noun1 •A graphical display of numerical data in the form of upright bars, with the area of each bar representing frequency.Such distinctions, however, require detailed information, such as histograms of the distribution of energy use among residential customers, both by month and by year. — 1983 verb1 •To represent (data) as a histogram. formshistogrammed · histogramming · histograms