Henry Martyn Robert hen·ry·mar·tynrobert uncommon noun 1. United States parliamentary authority and author (in 1876) of Robert''s Rules of Order (1837-1923) SynonymsRobertHenry M. RobertHenry Martyn Robert Related words Broader terms parliamentarian WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.