econometricsPronunciation: /ɪˌkɒnəˈmɛtrɪks/Definition of econometrics noun [treated as singular] the branch of economics concerned with the use of mathematical methods (especially statistics) in describing economic systems. Derivatives econometric adjective econometricianPronunciation: /-məˈtrɪʃ(ə)n/ noun econometrist noun Origin: 1930s: from economy, on the pattern of words such as biometricseconometrics in other Oxford dictionaries Definition of econometrics in the US English dictionary