Webster's English Dictionary

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infinitive

1. in.fin.i.tive \in-'fin-*t-iv\ aj [LL infinitivus, fr. L infinitus] : 
   formed with the infinitive  - in.fin.i.tive.ly av
2. infinitive n : a verb form normally identical in English with the first 
   person singular  that performs some functions of a noun and at the same 
   time displays some characteristics of a verb and is used with to (as "i 
   asked him to go") except with auxiliary and various other verbs (as "no one 
   saw him leave")