Entry 2 senses · 2 variants Webster, 1913 Subdiaconate · Sub·di·ac·o·nate · IPA a. n. 01 a. Of or pertaining to a subdeacon, or to the office or rank of a subdeacon. 1. Of or pertaining to a subdeacon, or to the office or rank of a subdeacon. 02 n. The office or rank of a subdeacon. 1. The office or rank of a subdeacon.