Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “radioactivity”

See all translations

radioactivity

noun [U] uk   /ˌreɪ.di.əʊ.ækˈtɪv.ɪ.ti/ us    /-oʊ.ækˈtɪv.ə.t̬i/
the quality that some atoms have of producing energy, which can be very harmful to health the energy produced by atoms in this way: A dangerous amount of radioactivity was released into the environment last month.
Translations of “radioactivity”
in Korean 방사능…
in Arabic نَشاط إشعاعي…
in Portuguese radioatividade…
in Catalan radioactivitat…
in Japanese 放射能…
in Italian radioattività…
in Chinese (Traditional) 放射(性), 放射線, 輻射線…
in Russian радиоактивность…
in Turkish radyoaktivite…
in Chinese (Simplified) 放射(性), 放射线, 辐射线…
in Polish promieniotwórczość, radioaktywność…
(Definition of radioactivity from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of radioactivity?
Add Cambridge dictionaries to your browser to your website

Definitions of “radioactivity” in other dictionaries

Word of the Day

white Christmas

a Christmas when it snows

Word of the Day

Cleavage proves divisive in Cambridge’s words of 2014

by Alastair Horne,
December 19, 2014
​​​​ Other dictionaries may choose faddish novelties as their words of the year, but here at Cambridge, we like to do something different. We look for the words that have seen sudden surges in searches over the course of the year – words that have been baffling users of English and driven them

Read More 

cinderella surgery noun

December 15, 2014
cosmetic surgery to the feet We have all heard of people having nose jobs, boob jobs and liposuction – but now a new trend growing in popularity in America: Cinderella surgery.

Read More