ACTIO PRO SOCIO

\ˈaktɪˌə͡ʊ pɹˈə͡ʊ sˈə͡ʊsɪˌə͡ʊ], \ˈaktɪˌə‍ʊ pɹˈə‍ʊ sˈə‍ʊsɪˌə‍ʊ], \ˈa_k_t_ɪ__ˌəʊ p_ɹ_ˈəʊ s_ˈəʊ_s_ɪ__ˌəʊ]\
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1910 - Black's Law Dictionary (2nd edition)
By Henry Campbell Black
 
1856 - A Law Dictionary
By John Bouvier