Definition of giga- in English:

giga-

combining form

  • 1Used in units of measurement.

    1. 1.1 Denoting a factor of 10⁹
      ‘gigahertz’
    2. 1.2Computing Denoting a factor of 2³⁰

Origin

From Greek gigas giant.

Pronunciation:

giga-

/ˈɡiɡə/