Wiktionary
intransitive verb
n. (context grammar English) An action verb not taking a direct object.
WordNet
intransitive verb
n. a verb (or verb construction) that does not take an object [syn: intransitive verb form]
Wikipedia
Intransitive verb
In grammar, an intransitive verb does not allow an object. This is distinct from a transitive verb, which takes one or more objects. The verb property is called transitivity.