a. The study of the rules whereby words or other elements of sentence structure are combined to form grammatical sentences.
b. A publication, such as a book, that presents such rules.
c. The pattern of formation of sentences or phrases in a language.
d. Such a pattern in a particular sentence or discourse.
2. Computer Science: The rules governing the formation of statements in a programming language.
3. A systematic, orderly arrangement.
[French syntaxe, from Late Latin syntaxis, from Greek suntaxis, from suntassein, to put in order : sun-, syn- + tassein, tag-, to arrange.]