giga-

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SI prefix
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From Ancient Greek γίγας (gígas, “giant”); cognate to giant.

giga-

In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁹ (short scale billion or long scale milliard). Symbol: G
‎giga- + ‎watt → ‎gigawatt ("one billion watts")
(computing, sometimes proscribed) Multiplying the unit to which it is attached by 2³⁰ or 1,073,741,824.
Synonym: gibi-
(slang) Augmenting an adjective; intensely, extremely, or to an exceptionally high degree.
Synonyms: super-, supra-, hyper-, ultra-, uber-, mega-

Wow, I am giga-jealous right now.
(Internet slang, originally 4chan) Used to augment nouns; denoting an invididual who is a paragon of something.
‎giga- + ‎Chad → ‎gigachad

‎giga- + ‎Stacy → ‎gigastacy

In computing, meaning is ambiguous between 10⁹ = 1,000,000,000 and 2³⁰ = 1,073,741,824. For precision, gibi- specifically means the binary 2³⁰; see binary prefix for discussion.

SI prefix

Belarusian: гіга- (hiha-)
Bulgarian: гига- (giga-)
Catalan: giga- (ca)
Chinese:
Cantonese: 吉- (gat¹), 激- (gik¹)

Mandarin: 吉- (zh) (jí-), 吉咖- (jígā-, jíkā-) (mainland China)
Czech: giga- (cs)
Dutch: giga- (nl)
Estonian: giga- (et)
Finnish: giga- (fi)
French: giga- (fr)
Galician: xiga- (gl)
Georgian: გიგა- (giga-)
German: giga- (de)
Greek: γίγα- (gíga-)
Hungarian: giga- (hu)
Ido: giga-
Indonesian: giga-
Japanese: ギガ (ja) (giga)
Korean: 기가 (giga-)
Malay: giga-
Polish: giga- (pl)
Portuguese: giga- (pt)
Russian: гига- (ru) (giga-)
Spanish: giga- (es)