# radioactivity

> English word · Noun · IPA /ˌreɪdɪəʊakˈtɪvɪti/ · frequency rank #32,550

## Definitions
1. Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.
2. The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc.

## Etymology
From radioactive + -ity or radio- + activity.

## Common misspellings (19)
`ardioactivity`, `raddioactivity`, `radiaoctivity`, `radioacctivity`, `radioacitvity`, `radioactiivty`, `radioactivitty`, `radioactivityy`, `radioactiviyt`, `radioactivtiy`, `radioactivvity`, `radioacttivity`, `radioactviity`, `radioatcivity`, `radiocativity`, `radoiactivity`, `raidoactivity`, `rdaioactivity`, `rradioactivity`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/radioactivity