Definition of giga- in English:

giga-

Pronunciation: /ˈɡɪɡə/

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 retroflex
Pronunciation: ˈretrəˌfleks
adjective
turned backward