Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “deca-”


prefix uk   /ˈdek.ə-/ us  
ten; used in forming nouns: decathlon (= a sports competition with 10 events) decahedron (= a shape with 10 faces) specialized (also deka-) science ten times the stated unit: a decapascal a decametre
(Definition of deca- from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of deca-?
Add Cambridge dictionaries to your browser to your website

Word of the Day


a skill or an ability to do something easily and well

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