Argument (linguistics)
In linguistics, an argument is an expression that helps complete the meaning of a predicate. Most predicates take one, two, or three arguments. A predicate and its arguments form a predicate-argument structure. The discussion of predicates and arguments is associated most with (content) verbs and noun phrases (NPs), although other syntactic categories can also be construed as predicates and as arguments. Arguments must be distinguished from adjuncts. While a predicate needs its arguments to complete its meaning, the adjuncts that appear with a predicate are optional; they are not necessary to complete the meaning of the predicate. Most theories of syntax and semantics acknowledge arguments and adjuncts, although the terminology varies, and the distinction certainly exists in all languages. In syntax, the terms argument and complement overlap in meaning and use to a large extent. Dependency grammars sometimes call arguments actants, following Tesnière (1959).
The area of grammar that explores the nature of predicates, their arguments, and adjuncts is called valency theory. Predicates have a valence; they determine the number and type of arguments that can or must appear in their environment. The valence of predicates is also investigated in terms of subcategorization frames.
Read more about Argument (linguistics): Arguments and Adjuncts, Syntactic Vs. Semantic Arguments, Representing Arguments and Adjuncts, Importance
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