seign·ior 
(sān-yôr, sānyôr′)
(sān-yôr, sānyôr′)n.
1. A man of rank, especially a feudal lord.
2. Used as a form of address for such a man.
[Middle English segnour, from Old French seignor, from Vulgar Latin *senior, from Latin, older, comparative of senex, sen-, old; see sen- in the Appendix of Indo-European roots.]
sei·gniori·al adj.