Entry 2 senses · 2 variants Webster, 1913 Neonomian · Ne·o·no·mi·an · IPA n. a. 01 n. One who advocates adheres to new laws; esp. one who holds or believes that the gospel is a new law. 1. One who advocates adheres to new laws; esp. one who holds or believes that the gospel is a new law. 02 a. Of or pertaining to the Neonomians, or in accordance with their doctrines. 1. Of or pertaining to the Neonomians, or in accordance with their doctrines.