greatest common factor
noun [ C ] mathematics US specialized uk/ˌɡreɪ.tɪst ˌkɒm.ən ˈfæk.tər/ us/ˌɡreɪt̬.ɪst ˌkɑː.mən ˈfæk.tɚ/ (abbreviation GCF); (UK highest common factor)
最大公约数（使一组数都能被整除的最大除数）
the largest number that can be used to divide two other numbers