prefix, slang ·Moderate ·College level

Definitions

Prefix

1. 1
   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). morpheme

   "giga- + watt → gigawatt ("one billion watts")"

2. 2
   Multiplying the unit to which it is attached by 2³⁰ or 1,073,741,824. morpheme, proscribed, sometimes
3. 3
   Augmenting an adjective; intensely, extremely, or to an exceptionally high degree. morpheme, slang

   "Wow, I am giga-jealous right now."

4. 4
   Used to augment nouns; denoting an invididual who is a paragon of something. Internet, morpheme

   "giga- + Chad → gigachad"

Synonyms

All synonyms

gibihypermegamul:gisupersupra

Antonyms

All antonyms

micromininano

Example

More examples

"giga- + watt → gigawatt ("one billion watts")"

Etymology

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

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.