"Syntactical" refers to anything related to the arrangement, structure, or grammar of sentences or language. It describes the proper order and organization of words, phrases, and clauses to form meaningful communication. Full definition
I read an advance reader's copy and I'm not a stranger to those so the extraordinary number of syntactical errors, dependent clauses with no antecedent and unchecked assertions of truth that have made me stumble and go back a sentence or more to decipher are uncommon and have interfered with my reading. (bookbrowse.com)
(Refer to Specifying name - value pairs on the spine itemref element for syntactical rules specific to local specification.) (idpf.org)
In addition to having their own private vocabulary, long term couples eventually «start to match each other in the basic rhythms and syntactical structures of their speech,» writes Shenk. (businessinsider.com)