What is the meaning of Giga-?

In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10 (short scale billion or long scale milliard).

Multiplying the unit to which it is attached by 2 or 1,073,741,824.

Augmenting an adjective; intensely, extremely, or to an exceptionally high degree.

Used to augment nouns; denoting an invididual who is a paragon of something.

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super-, extremely

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giga-, bilion

giga- (SI prefix multiplying the unit by 10)

giga- (SI prefix multiplying the unit by 10)

gibi- (IEC prefix multiplying the unit by 2)

Source: wiktionary.org