Entry 1 sense Webster, 1913 Syntactic /sĭnˌ-tăk'-tĭk/ · Syn·tac·tic · IPA /sɪnˈtæktɪk/ 01 a. Of or pertaining to syntax; according to the rules of syntax, or construction. 1. Of or pertaining to syntax; according to the rules of syntax, or construction.