Infinitive

[Sarah]

Basic form of verb: a form of a verb with no reference to a specific tense, person, or subject.

[Merna]

The basic form of a verb, without an inflection binding it to a particular subject or tense (e.g. see in we came to see, let him see).

[Britney]

To the above definitions not much can be added, except for this usage point: To, and I cant [emphasize] this enough, split an infinitive is considered to truly be [bad grammar] by many of the same people who think a [preposition] is a bad thing to incautiously end a sentence with.