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In linguistics, verb valency or valence refers to number of arguments controlled by a verbal predicate. It is related, though not identical, to verb transitivity, which counts only object arguments of the verbal predicate. Verb valency, on the other hand, includes all arguments, including the subject of the verb.

The linguistic meaning of valence is derived from the definition of valency in chemistry.

There are several types of valency:

• An avalent verb takes no arguments, e.g. It rains. (Though it is technically the subject of the verb, it is only a dummy subject, and doesn't have a true meaning.)
• A monovalent verb takes one argument, e.g. He sleeps.
• A divalent verb takes two, e.g. He kicks the ball.
• A trivalent verb takes three, e.g. He gives her a flower.

The verb requires all of these arguments in a well-formed sentence, although they can sometimes undergo valency reduction or expansion.

For instance, to eat is naturally divalent, as in he is eating an apple, but may be reduced to monovalency in he is eating in the garden. In the garden here is not a verb argument, and hence not an element of valency. This is called valency reduction.

Verbs that are usually monovalent, like to sleep, cannot take a direct object. However, there are cases where the valency of such verbs can be expanded, for instance in He sleeps the sleep of death. This is called valency expansion.

Please help improve this article or section by expanding it. Further information might be found on the talk page or at requests for expansion. (October 2007)

The term valence has a related technical meaning in lexical semantics that elaborates on the role of argument structure - it refers to the capacity of other lexical units to combine with the given word. For instance, valence is one of the elements defining a construction in some Construction Grammars. This sense of the term, sometimes called Lexical Valency, is related to the above, but is far richer than the numerical notion inherited from chemistry.

• Verb argument
• Arity
• Verb
• Morphosyntactic alignment
• Transitivity (grammatical category)

• English Valency Structures - A first sketch
• The difference between lexical and grammatical valency
• What is valency?