Definition from Wiktionary, the free dictionary
This category contains only other categories, no dictionary entries. Its subcategories are on the topic: Radioactivity. They are of two sorts:
- Subcategories named like "aa:Radioactivity (with a prefixed language code) are categories of terms in specific languages. For example, "fr:Radioactivity is the Radioactivity-related category of French terms. You may be interested especially in Category:en:Radioactivity, for English terms.
- Subcategories of this one named without the prefixed language code are further categories just like this one, but devoted to topics finer than Radioactivity.
This category has the following 7 subcategories, out of 7 total.