sub·di·ac·o·nate 
(sŭb′dī-ăkə-nĭt)
(sŭb′dī-ăkə-nĭt)n.
The office, order, or rank of subdeacon.
[Late Latin subdiāconātus, from subdiāconus, subdeacon (partial translation of Late Greek hupodiākonos) : Latin sub-, sub- + Late Latin diāconus, deacon; see DEACON.]
sub′di·aco·nal adj.