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Definitions

radioactivity

[rey-dee-oh-ak-tiv-i-tee] / ˌreɪ di oʊ ækˈtɪv ɪ ti /


NOUN
radiation
Synonyms


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

That process releases huge amounts of energy, no carbon emissions and limited radioactivity.

From The Wall Street Journal • Dec. 18, 2025

There, Erikson teased out the stealthy, almost sinister peculiarities of modern man-made hazards, like radioactivity and toxicity, and their special, traumatic effects.

From The Wall Street Journal • Dec. 18, 2025

As well as radioactivity, chemical exposure could also be a problem for anyone nearby.

From BBC • Jun. 19, 2025

The Cabrera Services report noted the radioactivity at the Albany Bulb is consistent with other landfills that accept construction debris, which may contain naturally radioactive material, such as granite.

From Los Angeles Times • Dec. 2, 2024

Mutations also occur because of radioactivity or ultraviolet light from the Sun or cosmic rays or chemicals in the environment, all of which can change the nucleotides or tie the nucleic acids up in knots.

From "Cosmos" by Carl Sagan