infinitive (n.) (inf, INF)

A traditional term for the non-finite form of the verb usually cited as its unmarked or base form, e.g. go, walk, kick, though some languages mark it syntactically or morphologically. In English, the infinitive form may be used alone or in conjunction with the particle to (the to-infinitive), e.g. he saw her go v. he wants to go. The form without to is sometimes known as the bare or zero infinitive. Inserting an adverb or other element between the to and the verb results in the split infinitive. In government-binding theory, the term infinitive (or infinitival) clause is used for constructions with to-infinitive.