Late 18th century; earliest use found in Agnes Bennett (d. 1808). From classical Latin socia female partner or associate, feminine form corresponding to socius.
Definition of socia in US English:
socia
nounˈsəʊʃ(ɪ)ə
rare
A female friend or companion.
Origin
Late 18th century; earliest use found in Agnes Bennett (d. 1808). From classical Latin socia female partner or associate, feminine form corresponding to socius.