radioactivity
/ˌreɪdɪəʊakˈtɪvɪti/
radioactivity noun: spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.
Noun
radioactivity (usually uncountable, plural radioactivities)
- Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.
- Today, no one would intentionally smear radioactive materials on their face, but in 1933, the dangers of radioactivity were not yet fully understood.2020 March 8, Jacopo Prisco, “When beauty products were radioactive”, in CNN
- The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc.
radioactivity meaning in Hindi, Tamil, Telugu and Malayalam
radioactivity in Hindi
- emission of ionizing radiation
- विकिरणशीलता vikirṇaśīltā
- radiation emitted
- विकिरण vikiraṇ
radioactivity in Tamil
- emission of ionizing radiation
- கதிரியக்கம் katiriyakkam
- radiation emitted
- கதிரியக்கம் katiriyakkam
radioactivity in Telugu
- radioactivity
- రేడియోధార్మికత rēḍiyōdhārmikata
radioactivity in Malayalam
- റേഡിയോ ആക്റ്റീവത
More languagesFewer languages
- radioactivity in Tagalog
- karagilapan
- radioactivity in Thai
- กัมมันตภาพรังสี, รังสี rang-sǐi
- radioactivity in Vietnamese
- sự phóng xạ
Examples of radioactivity in a sentence
- The radioactivity was released when they blew off steam from the containment vessel.
- The instrument detected an increase in radioactivity.
- The radiation trackers clipped to our protective overalls let off soft cheeps, their frequency varying as radioactivity levels changed around us.
Forms of radioactivity
| plural | radioactivities |
|---|---|
| alternative form | radio-activity |
Origin of radioactivity
From radioactive + -ity or radio- + activity.
Words formed from radioactivity
Questions about radioactivity
- What does radioactivity mean?
- Radioactivity means spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.
- What is radioactivity in Hindi?
- Radioactivity in Hindi is विकिरणशीलता (vikirṇaśīltā), विकिरण (vikiraṇ). See Radioactivity meaning in Hindi.
- What part of speech is radioactivity?
- Radioactivity is a noun.
- How do you pronounce radioactivity?
- Radioactivity is pronounced /ˌreɪdɪəʊakˈtɪvɪti/.
- What is the plural of radioactivity?
- The plural of radioactivity is radioactivities.
Words near radioactivity in the dictionary
Source and license
Adapted from Wiktionary: radioactivity (page history and authors); రేడియోధార్మికత (Telugu) (page history and authors); radioactivity (Malayalam Wiktionary) (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.
Last updated:
Pronunciation audio from Wikimedia Commons, each file under its own free license: LL-Q1860 (eng)-Vealhurl-radioactivity.wav.
Cite this entry: “radioactivity.” Word.ws, https://word.ws/radioactivity. Based on Wiktionary, CC BY-SA 4.0.