pro·pos·i·tus 
(prō-pŏzĭ-təs)
(prō-pŏzĭ-təs)n. pl. pro·pos·i·ti (-tī′)
1. Law The person who is the subject of a question or action.
2. A person to whom descendants are commonly related.
3. See index case.
[Latin prōpositus, past participle of prōpōnere, to set forth; see PROPOSE.]