Definition of giga- in English:

giga-

Syllabification: giga-

combining form

Used in units of measurement.
1Denoting a factor of 109: gigahertz
2 Computing Denoting a factor of 230.

Origin

from Greek gigas 'giant'.

Definition of giga- in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up