DI- Meaning of DI- in English [di-] comb form [ME, fr. MF, fr. L, fr. Gk; akin to OE twi-] 1: twice: twofold: double "dichromatic" 2: containing two atoms, radicals, or groups "dioxide" Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012