Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “giga-”


prefix     /ɡɪɡ.ə-/
1,000,000,000 times the stated unit : gigavolt gigahertz gigawattCardinal numbers, including nought and zero
(Definition of giga- prefix from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of giga-

Word of the Day


a situation in which two people are friends

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More