DictionaryRoot: socius
Latin
socius
companion, ally
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noun
sociology
soh-see-AH-luh-jee/ˌsəʊsiˈɑːlədʒi/
The scientific study of human society.
Etymology
Socius places companionship at the heart of the word: sociology studies people living in association. The ending turns that subject into a field of systematic study.